Limited Virtual Domain Support in iCS 5.0 Patch 2

(See attachment)

After doing more reading I realized I do not need virtual mail users. I just need mydomain.com as a local host alias along with mail.mydomain.com, what is the best way to do that in 10.5.2 ?

Similar Messages

How to let mmp_smtp support virtual domain authentication by user/pass

my mmp had configured 2 virtual domain ,one is mmp1.soft.com,other is mmp2.soft.com
i can send mail by mmp use the user/pass format : mmp1user/pass , which is sotred in o=mmp1.soft.com,o=isp in ldap,and the format [email protected]/pass which is stored in o=mmp2.soft.com,o=isp in ldap,
but i can't send mail use the format: mmp2user/pass.
the pop is work fine.
the following is my config file:
more PopProxyAService.cfg
default:LdapUrl "ldap://mmp1.soft.com:389/o=internet"
default:LogDir /var/Sun/ims52/mmp-mail2/log
default:LogLevel 10
default:BindDN "cn=Directory Manager"
default:BindPass "soft"
default:BacksidePort 8110
default:ConnLimits 0.0.0.0|0.0.0.0:20
default:VirtualDomainFile /var/Sun/ims52/mmp-mail2/vdmap.cfg
default:DefaultDomain mmp1.oft.com
default:SearchFormat (uid=%U)
default:VirtualDomainDelim @
default:CanonicalVirtualDomainDelim @
default:AuthCacheTTL 1
default:LdapCacheTTL 1
default:HostedDomains yes
more vdmap.cfg
vdmap mmp2 192.192.192.192
mmp2:DefaultDomain mmp2.soft.com
mmp2:BindDN "cn=Directory Manager"
mmp2:BindPass "oft"
mmp2:LdapUrl "ldap://mmp2.soft.com:389/o=internet"
more SmtpProxyAService.cfg
default:LdapUrl "ldap://mmp1.soft.com:389/o=internet"
default:LogDir /var/Sun/ims52/mmp-mail2/log
default:LogLevel 10
default:BindDN "cn=Directory Manager"
default:BindPass "soft"
default:ConnLimits 0.0.0.0|0.0.0.0:20
default:VirtualDomainFile /var/Sun/ims52/mmp-mail2/vdmapsmtp.cfg
default:DefaultDomain mmp2.soft.com
default:SmtpProxyPassword soft..ssl
default:LdapCacheTTL 1
default:SmtpRelays mmp1
more vdmapsmtp.cfg
vdmap mmp2 192.192.192.192
mmp2:DefaultDomain mmp2.soft.com
mmp2:BindDN "cn=Directory Manager"
mmp2:BindPass "soft"
mmp2:LdapUrl "ldap://mmp.soft.com:389/o=internet"
mmp2:LdapCacheTTL 1
mmp2:AuthCacheTTL 1
mmp2:SearchFormat (uid=%s)what's the error with my configuration?
Does the virtual domain is supproted by mmp_smtp,and does user can auth to smtp by user/pass ,but not by user@domain/pass ?
thanks in advance!
null

ok,let's discuss with data.
i want to migrate another domain "soft.com" to my current Messaging Server,
i have created the new host domain : soft.com ,and the user "testmail" belongs to that domain.
the following show the process of my login.
220 ESMTP Messaging Multiplexor (iPlanet Messaging Server 5.2 (built Feb 21 2002)
helo soft.com
250 mail2
auth login
334 VXNlcm5hbWU6
dGVzdG1haWw= (which is "testmail" after base64 decode)
334 UGFzc3dvcmQ6
cGFzczR0ZXN0bWFpbA== (which is "pass4testmail" after base64 decode)
535 5.7.8 Bad username or password (Authentication failed).
220 ESMTP Messaging Multiplexor (iPlanet Messaging Server 5.2 (built Feb 21 2002)
helo soft.com
250 mail2
auth login
334 VXNlcm5hbWU6
dGVzdG1haWxAc29mdC5jb20= (which is "[email protected]" after base64 decode)
334 UGFzc3dvcmQ6
cGFzczR0ZXN0bWFpbA== (which is "pass4testmail" after base64 decode)
235 2.7.0 login authentication successful.
mail from:[email protected]
250 2.5.0 Address Ok.
quit
221 2.3.0 Bye received. Goodbye.becase i start the ssl connection for user to send and receive mail ,so i have to use mmp as smtp/pop/imap proxy. i don't want the user of domian "soft.com" need modify any of their mail client after the migration ,that means,the user of domain "soft.com" can login use "testmail",but not "[email protected]".
i don't know whether i have described my question clearly,thanks for endure my lame english~ ! :)

Virtual Domain Controllers in 2012 Failover Cluster. Time Skew

Hi All,
Not sure if this is the correct space for this topic, however i'll give it a go anyway.
We have a 2 Hosts (HP DL385) Windows Server 2012 Failover Cluster.
Storage is provided by a 12 Bay NAS with iSCSI connections (This is catering for CSV's and Quorum)
We are running 2 Virtual domain controllers (2008R2)
The issue we experience is that if the cluster goes down, and when it comes back online the time on the domain controllers (one or the other or both) skews by any where up to 3 days which causes havoc for our office until we can resync clocks with the PDCe.
Time Synchronisation Integration Service is disabled on both Domain Contollers
A few days back we need to reboot the storage on the cluster, and the tasks performed were as follows:
-Power off all virtual machines (Graceful Shutdown)
-Put all CSV's into maintenance mode
-Offline Disk Witness to Quorum
-Rebooted Storage (Waited until it came back online)
-Online Quorum Storage (Successful)
-Bring CSV's out of maintenance mode (Successful & Browsable)
-Power on all Virtual Machines (Successful)
This is where the time Skewed and caused headaches. The time for some reason went to 2 days 11hrs in the past on 1 domain controller.
With this DNS lookups failed to work, Cluster services failed, Cluster Aware Updating Failed, RDP to VM's (and Virtual Hosts) by DNS Name failed (Date time error)
There doesn't seem to be anything in the EventLog except for date/time stamp on events being 2 days in the past.
Now this is why i'm not sure if the issue is cause by fail over clustering, or is an issue with the domain controllers.
Any advice regarding this or if anyone has seen this behaviour before any info would be great
Thanks
Rob

Hi Rob,
Does both this two DCs on your cluster VM and there have not others DCs? Microsoft recommends that files for virtualized domain controllers be placed on non-CSV
disks, Non-CSV disks can be brought online without authentication. Because non-CSV disks can be brought online more easily.
For virtual machines that are configured as domain controllers, it is recommended that you disable time synchronization between the host system and guest operating
system acting as a domain controller. This enables your guest domain controller to synchronize time from the domain hierarchy, please confirm your PDC time is always correct.
The related KB:
Running Domain Controllers in Hyper-V
https://technet.microsoft.com/en-us/library/d2cae85b-41ac-497f-8cd1-5fbaa6740ffe(v=ws.10)#deployment_considerations_for_virtualized_domain_controllers
Things to consider when you host Active Directory domain controllers in virtual hosting environments
http://support.microsoft.com/kb/888794?wa=wsignin1.0
I’m glad to be of help to you!
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact [email protected]

Virtual domains and their installation

Hello again Alex,
and anyone else able to enlighten me.
Thank you all for your help the last time I was in need.
I'm setting up Postfix by editing the postfix files directly without using server admin due to it's limitations. Especially since I'm using an external GW in a DMZ along with an internal server delivering the mail.
And now I would like to add virtual domains using "Postfix virtual MAILBOX example: separate domains, non-UNIX accounts". Is this possible with OS X?
I have read what is on postfix.org, I have read what is in Alex's installation guide but there are a few things I'm not getting.
I've created the virtual domains and all that stuff but I'm not getting the creation of user access. Do you mean I actually need to create each and every user acessing mail in Workgroup manager?
Could you point me to some information that bypasses the use of server admin but is still usefull in setting up mail under OS X. I don't want to use SA since I do not want to ruin my manual setup of the Postfix files.
Kind regards
Hans

Are you then saying it would be easier to define the
users in workgroup manager and use a couple of
aliases for each user acessing mail?
Definitely easier, but with the limitations you already know.
Is it possible, using this method to use names like
[email protected], [email protected] etc. rather than
[email protected], [email protected] etc.
Sure, just follow my tutorial.
And when
logging into the mailservice do I then have to use
the full [email protected] as a user login name to
access the virtual mailboxes?
Yes, full name with domain.
And is it correct to assume that when using the
server for more than one domain I need to define the
first as a local domain and the rest as virtual
domains?
Yes (if you want to have "hans" as a different user in each domain).
Alex
P.S. Just make a backup fo main.cf so you can copy paste changes that might get hosed by Server Admin. Once your setup is complete, adding users through WGM or aliases through /etc/postfix/virtual will not touch main.cf

Virtual Domains in WCS

hello
i have a WCS 7.0.172.0 that in theory supports 252 virtual domains. However i just only let me create 124.
I see this note in cisco
Note        WCS supports up to 252 virtual domain in version 5.2 and later. For versions prior to 5.2, WCS supports up to 124 virtual domains.
but i dont know what happend.
thnks for your help.

Luis:
It is either the message wrong or there is something wrong.
But looking into the documatation, on WCS 7.0 (and also WCS 6.0) config guide it says:
'''snip'''
     The maximum number of virtual domains that can be defined in WCS is 124.
'''snip'''
Reference: http://tiny.cc/6fd6bw
on WCS 7.0MR1 config guide it says:
'''snip'''
     WCS supports up to 252 virtual domain in version 5.2 and later. For versions prior to 5.2, WCS supports up to 124      virtual domains.
'''snip'''
Reference: http://tiny.cc/8nd6bw
The second statement contradicts with information in 6.0 and 7.0 config guide. 7.0 guide says that max number of virtual domains is 124. 7.0MR1 however sayss for all versions of 5.2 and later it supports 252!!
I think there is a documentation problem here. It would probably be 124 as the maximum but it is documented improperly.
Luis: what the message you get when you try to add one more vitual domain (virtual domain number 125)? does it show you any messages?
if you are authorized for TAC support it is better to open a TAC case. if not I suggest that you do a feedback on the document that mentions that the supported virtual domains is 252 and let them check wih BU if the document informaiton is correct or not. The first option is better and faster.
Sorry for not being able to help further. But this ovreall needs Cisco intervention to explain the matter.
Thansk.
Amjad

Weblogic-next, virtual domains and SSL

Hi
Current versions of WL (6.1 and below) do not support distinct
Certificates for each virtual domain. This means that we cannot
support multiple secure sites (HTTP-S based) using the virtual domain feature
in WL. And this affects us as we are an ASP, and our customers need distinct domain
names.
Another issue is that the security realm (RDBMS, File, whatever)
is shared amongst the virtual domains, so the authentication
database is essentially common for all our customers.
Will these problems be fixed in the upcoming major release of
WebLogic ? I'd greatly appreciate it someone within WL can
send me an answer - group post/private. (I'm also trying the sales/support channels).
thanx
-john mani
director, engineering
6D

smcnulty,
You are referring to Cyrus ACLs which apply to IMAP and not SMTP. As I said IMAP logins work just fine, it was SMTP that didn't accept the user. User creation with WGM works well, no problems here. Your tips may surely be of help to someone having IMAP/POP issues.
pterobyte:
Alex saved the day (again). You were certainly right that postfix didn't even know about the configurations I made in /etc/postfix/virtual. Everything is working fine now and I am only waiting for my DNS transfer to finally carry over. I only need to setup a backup MX, nothing more to do.
Thanks
MacLemon
PS: Sorry, the system chokes an error upon awarding stars and marking as solved. Will try again at a later date.
Message was edited by: MacLemon, added note about problems marking as solved and awarding stars.

Limitations of Developer Support

I am evaluating Azure Virtual Machines as a possible solution for a staging server for my production software (3rd party app). I am having trouble getting a straight answer to the limitations of developer support. Since this is only a staging
server I don't want to pay $300/month for "Standard" support since that's twice what I pay for the VM! But it looks like "Developer" level support may not include essential support options. For example, suppose I need a support
engineer to log into the VM's "console" in order to remedy a problem with a service that is preventing a clean boot? There has been occasions when I've needed that with my production server and in that case they have data center techs who will
do that for no additional charge. Is this scenario supported under Developer support? When I go to create a ticket I don't see anything like this as an option. TIA

Hi JoeGMag,
You need an Azure Support plan to receive one-on-one technical support for break-fix issues for $29.
Please see http://azure.microsoft.com/en-us/support/plans/
Support for billing and subscription management issues are covered with your Azure subscription at no additional charge, and you don’t need to have an Azure Support plan to raise these issues.
Recommend you to submit a Free Billing support ticket for furthur queries on billing.
To submit an incident, go to the
Azure Support site and click on Get Support.
Regards,
Shirisha Paderu.

Can I move a Virtual Domain Controller from one host(Win Server 2008 R2) to another (Win Server 2012 R2) ? Are there any issues?

Can I move a Virtual Domain Controller from one host(Win Server 2008 R2) to another (Win Server 2012 R2) ? Are there any issues?

I also had this error: "Setup cannot continue. Your computer will now restart, and your previous version of Windows will be restored."
trying to do a in-place upgrade of a Domain Controller Windows 2008 R2 to Windows 2012 R2.
The problem was the separated System Reserved Partition. After I removed using this instructions:
http://jacobackerman.blogspot.com/2012/12/how-to-remove-system-reserved-partition.html
The upgrade ran ok, and now have my DC as Windows 2012 R2.
Hope that helps!.

10.5.2 Virtual Domains - 2 user questions

(NOTE: Generic host and domain names used in this mail, real ones are used for the actual machine)
Clean 10.5.1 install, immediately hit software update multiple times till 10.5.2 and any other offered updates were installed.
Went into WGM and created the accounts for my virtual domain users (I will not be doing any mail accounts on the main server which is called localhost.local) using the same setup as the 10.5.1 tutorial referenced many times on this site. I made no by-hand file changes other than making the bounces soft instead of hard, as I think that virtual domains are supposed to work now with 10.5.2.
Went into Server Admin, added Mail as a service and configured it with my virtual domain in the Advanced/Hosting tab and turned on debug output for SMTP and POP.
Pointed my firewall at the new mail server so that DNS would be correct
Tried sending a mail from my test user to my test user from a mail client on my LAN.
YAY! It works!
Ok, so with the WGM version of virtual domains, where do I put the dreaded catch-all user for the one domain that required it?
Do I just make a virtual user account with the second shortname being @mydomain1.com?
And, for forward-only mail addresses do I make a virtual user account with the "mail" tab set to forward?
Or, do I still use the tutorial method for those features where I edit files directly?
Thanks, and (fingers crossed) last question for a while.
------ main.cf ------
queue_directory = /private/var/spool/postfix
command_directory = /usr/sbin
daemon_directory = /usr/libexec/postfix
mail_owner = _postfix
unknown_local_recipient_reject_code = 450
unknown_virtual_alias_reject_code = 450
unknown_virtual_mailbox_reject_code = 450
debug_peer_level = 2
debugger_command =
PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
xxgdb $daemon_directory/$process_name $process_id & sleep 5
sendmail_path = /usr/sbin/sendmail
newaliases_path = /usr/bin/newaliases
mailq_path = /usr/bin/mailq
setgid_group = _postdrop
html_directory = no
manpage_directory = /usr/share/man
sample_directory = /usr/share/doc/postfix/examples
readme_directory = /usr/share/doc/postfix
mydomain_fallback = localhost
message_size_limit = 10485760
myhostname = localhost.local
mailbox_transport = cyrus
mailbox_size_limit = 0
mydomain = local
enable_server_options = yes
inet_interfaces = all
smtpd_client_restrictions = permit_mynetworks reject_rbl_client zen.spamhaus.org permit
maps_rbl_domains =
content_filter = smtp-amavis:[127.0.0.1]:10024
smtpd_sasl_auth_enable = yes
smtpd_use_pw_server = yes
smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination,permit
smtpd_pw_server_security_options = cram-md5
virtual_transport = lmtp:unix:/var/imap/socket/lmtp
virtual_mailbox_domains = hash:/etc/postfix/virtual_domains
---------- virtual --------
This file is empty other than comments
----------- virtual_domains ----------
mydomain1.com allow
mydoamin2.net allow

Thanks for the feedback. Good to hear virtual domains set up from scratch work in 10.5.2.
Ok, so with the WGM version of virtual domains, where do I put the dreaded catch-all user for the
one domain that required it?
Do I just make a virtual user account with the second shortname being @mydomain1.com?
To be honest, I never tried, but I seriously doubt this will work (worth trying though). I'd put it in /etc/postfix/virtual (can coexist fine with WGM, but you'll need to add the reference to it to main.cf
And, for forward-only mail addresses do I make a virtual user account with the "mail" tab set to forward?
As above, worth trying. Doubt it'll work through WGM.
Generally speaking and from my experience and assuming there are no bugs, Server Admin and WGM allow for basic setups. Anything slightly advanced is better done through the command line. Sad but true.

Can I make a subfolder a Virtual Domain?

Greetings all,
Still on Tiger Server. I've created virtual domains before like this:
Default: /Library/WebServer/Documents
Virtual1: /Library/WebServer/Virtual1
But I want to know if I can do this:
Default: /Library/WebServer/Documents
Virtual1: /Library/WebServer/Documents/subfolder1
Virtual2: /Library/WebServer/Documents/subfolder2
I have the Virtual domains entered in DNS, but they ALL just go to the default site right now, even though I defined the virtual domains (using Server Admin) as their own domains pointing to the subfolder path.
What am I doing wrong? Thanks in advance for any assistance!

Sure you can do what you want - just be aware that http://default.com/subfolder1/ will be the same content as http://virtual1.com/ since they both point to /Library/WebServer/Documents/subfolder1.
That said, you probably have a wildcard (*) set in the Aliases section of the default site. This tells apache to match this virtual host to all hostnames so the others never get referenced. Remove the *.

MS Access database limits which LabVIEW Supports

MS Access database limits which LabVIEW Supports,
When i fetch 10MB database,then LabVIEW shows some error. which i am attaching with this post. please guide me on this.
Prashant Soni
LabVIEW Engineer
Attachments:
1.jpg ‏3001 KB

Ravens Fan wrote:
How do people who don't know how the forum works and the basic standards of posting .png's or .jpeg's, ever figure out that they are capable of bypassing the .bmp ban by just renaming the file? If people are smart enough to figure out that a bitmap file with .jpeg extension still opens, you'd think they were smart enough to realize what file format they should really be posting.
They assume changing the file ending actually changes the format?
/Y
LabVIEW 8.2 - 2014
"Only dead fish swim downstream" - "My life for Kudos!" - "Dumb people repeat old mistakes - smart ones create new ones."
G# - Free award winning reference based OOP for LV

Setting up email accounts for virtual domains....

Hello,
I am bringing my email hosting in-house and am having problems getting it to work. I follow the documentation as best I can and am ending up with the inability to log into the account with my email client.
I can send emails the the account without any bounce back, and my email client (Apple Mail) can find the server, but my login is failing.
I can also ping the domain and it is resolving to the correct IP.
I've :
- enabled virtual domains
- added the domain
- added a user with the a shortname of [email protected]
- given the user access to the mail service in server admin.
My client is setup as:
username: [email protected]
passwork: ****
incoming server: mail.virtualdomain.com
My hunch is that I am not correctly setting up the user and/or their permissions.
Any help would be appreciated.
cheers,
jr

Thanks for the pointer.
the mailaccess.log is empty and the ApplePassword* has no references to mail access attempts.
Although I am not sure what needs to be fixed, it does seem to indicate that the server isn't responding to login attempts.
The mail client is Apple mail.
In addition, the test messages I sent did actually get bounced back, it just tool several hours.
The additional test that I ran was turning off the mail services from the server preferences. This resulted in the client not being able to find the server at all.
So, it's not completely messed up, but appears to be misconfigured.
cheers,
jr

Reporting-MTA not using virtual domains

I hope this will be an easy answer that I'm just not seeing...
I have mail running on 10.5.2 with multiple virtual domains.
vdomain1.com
vdomain2.com
vdomain3.com
etc.
Receiving mail and sending mail both work fine, except on occasion I get the following error trying to send to certain addresses (mchsi.com is one example):
<[email protected]>: host gateway.mchsi.com[204.127.203.150] said:
550-63.254.110.6 blocked by ldap:ou=rblmx,dc=mso,dc=att,dc=net 550 Blocked
for abuse. Please contact the administrator of your ISP or sending
mailservice. (in reply to MAIL FROM command)
Reporting-MTA: dns; mail.XServeMail.local
X-Postfix-Queue-ID: 87047361E24
X-Postfix-Sender: rfc822; [email protected]
From what I can tell, the mail server is using the machine's host name (mail.XServeMail.local) as specified in Server Admin as opposed to using something like mail.vdomain1.com.
Is there a way to tell it to use mail.vdomain1.com when mail is sent from that address, use mail.vdomain2.com when mail is sent from that address, etc.?
I've been reading a lot of the Postfix configuration information, but don't want to start down the wrong path without someone providing a bit of guidance first.
Here is the postconf -n output:
command_directory = /usr/sbin
config_directory = /etc/postfix
content_filter = smtp-amavis:[127.0.0.1]:10024
daemon_directory = /usr/libexec/postfix
debugpeerlevel = 2
enableserveroptions = yes
html_directory = no
inet_interfaces = all
mail_owner = _postfix
mailboxsizelimit = 0
mailbox_transport = cyrus
mailq_path = /usr/bin/mailq
manpage_directory = /usr/share/man
mapsrbldomains =
messagesizelimit = 0
mydestination = $myhostname,localhost.$mydomain,localhost
mydomain = XServeMail.local
mydomain_fallback = localhost
myhostname = mail.XServeMail.local
mynetworks = 127.0.0.0/8
newaliases_path = /usr/bin/newaliases
queue_directory = /private/var/spool/postfix
readme_directory = /usr/share/doc/postfix
relayhost =
sample_directory = /usr/share/doc/postfix/examples
sendmail_path = /usr/sbin/sendmail
setgid_group = _postdrop
smtpdclientrestrictions = permit_mynetworks
smtpdenforcetls = no
smtpdpw_server_securityoptions = login,plain,cram-md5
smtpdrecipientrestrictions = permitsasl_authenticated,permit_mynetworks,reject_unauthdestination,permit
smtpdsasl_authenable = yes
smtpdtls_certfile = /etc/certificates/Default.crt
smtpdtls_keyfile = /etc/certificates/Default.key
smtpduse_pwserver = yes
smtpdusetls = yes
unknownlocal_recipient_rejectcode = 550
virtualmailboxdomains = hash:/etc/postfix/virtual_domains
virtual_transport = lmtp:unix:/var/imap/socket/lmtp
Thank you in advance for any help.

You cannot use a different host name depending on the sending domain and also this is not necessary.
What you need to do is to give your mail server a fully qualified hostname that can be resolved by an external DNS lookup. Also make sure your mail server's IP has a proper reverse PTR record.

Prime Infrastructure 1.4 e-mail from virtual domains

Hi
Is there any way in PI 1.4 to configure e-mail alerts to be sent to different recipients for different virtual domains. We have several large sites, each with their own controllers and AP's (16 controllers & 4000+ AP's) and I'd like to be able to set things up so that the admin for each site gets any alerts for that site e-mailed only to them. The only way I can find to group the site devices is to put them in a virtual domain (subordinate to ROOT-DOMAIN) but e-mail recipients only seem to be configurable from ROOT ?
So would have:
Site A, controller A & AP's, alerts e-mailed to Admin_A
Site B, Controller B & AP's, alerts e-mailed to Admin B etc.
Thanks
Alan

This is exacly what I am trying to do as well Kilravock. We have a distributed management model where I would like to have the email alerts sent to the admins for each domain.
If someone knows how to perfom this I would love to hear how to do it because I can't find instructions in any of the Ciso documentation.
Any insight would be apreciated!
-Thanks in advance

DNS for Mail service Virtual Domains

On a server primarily running as a Mail server with 10.6.3 (DNS and OD also running)
If host name is mail.domain.com and
if mail service has a virtual domain virtualdomain.com,
in the DNS setup, virtualdomain.com should have an MX record like mail.virtualdomain.com and either an A record pointing to the IP of mail.domain.com OR a CNAME pointing to mail.domain.com?
When setting to the CNAME, DNS logs says:
"25-May-2010 11:47:52.610 zone virtualdomain.com/IN/com.apple.ServerAdmin.DNS.public: virtualdomain.com/MX 'mail.virtualdomain.com' is a CNAME (illegal)"
but if I set to an A record pointing to the IP, isn't there a PTR conflict with the mail.domain.com pointing to the same IP?

SMTP requires an A or AAA as the required response for the box named in an MX.
Your MX for the domain or subdomain would/should/must aim at an A or AAA.
Not a CNAME. That's considered illegal.
Yes, random domains can all have their respective MX records pointing to the same mail server. So long as the mail server has an A or AAA record. And that mail server itself is expected to be configured to accept mail for those domains for local delivery, or as part of a relay.

Limited Virtual Domain Support in iCS 5.0 Patch 2

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