SMTP Port 25 blocked to my own relay server?

Hi all,
I am a noob to this forum. So dont smake me to hard.
I have the Verizon Wireless/router/modem I was looking around in there to allow me to use my hp scanner to connect to a smtp server across the wan. The firewall on the other side is allowing my traffic in so I should be able to hit the relay server (NOT VERIZON'S) but I have my own in a remote location but I cannot get it to work communicate on port 25.
If I open port 27 ESMTP on the destination and change the smtp server to use it then I can telnet ipaddress 27 and I would get the HELO response but not the case with port 25. Of course you maybe thinking "Why dont you set your scanner for 27"? Well I wish I could or I would not be in this forum
Its an HP 4100MFP scanner and there is an option of "SMTP" i enter the SMTP gateway address and thats it no other option.
So I will assume its blocked even though I want to hit my own smtp relay server ip ? I suppose my only other option is to put a firewall in and just vpn to the destination and be done with it. Anyhow I wanted to ask the group in this forum.
I have seen a few things on SMTP before I posted but not exactly what I wanted, it seems folks want access to smtp period but I just want access to my own SMTP server in a remote location.. So is it possible on port 25 or am I over looking something in my verizon mia424wr.
I assure you its NOT the destination.
thanks for reading.

What about Port 80 - is it blocked?
What ports are blocked using Verizon FiOS?
No ports are blocked on business accounts with static IP addresses.
or port 80 info, see: »Verizon Online FiOS FAQ »What about Port 80 - is it blocked?
Outbound port 25 has been blocked on and off in the past, most recently blocked again effective 6/1/10. Inbound port 25 is currently open. Even if port 25 is not blocked, Verizon's dynamic IP addresses are listed in both the Spamhaus Policy Block List (PBL) and MAPS DUL. The PBL is/can be used by mail exchange servers (MX's) to reject connections from these addresses. Thus, for the purpose of running a mail exchange server port 25 is effectively blocked. However, a mail server can be run that utilizes Verizon's authenticated SMTP just like your mail client would do.
As always, YMMV. It has been reported that sometimes a port which should be blocked by standard Verizon policy has instead been left open. Which ports are blocked may change in the future.

Similar Messages

SMTP port number resets to 25 after every reboot

Because of our ISP, we have to use a non-standard SMTP port number to send via our mail server. This works just fine when I change the SMTP port in the Mail program. However, every time I reboot my MacBook, the port is reset back to 25, and I have to manually go in and change the port number again. This is of course really annoying. Does anyone have a fix for this problem, and has anyone else experienced it? Thanks for any help!

No, you wouldn't see any error messages, because as far as the system knows, it is saving those changes. But if the file is corrupt, those changes don't stick when you quit Mail, so it reverts to the default.
Since you have a POP account, quit Mail, remove the com.apple.mail.plist file from Home/Library/Preferences, then restart Mail and setup the account(s) again and Mail will find and "import" the existing email folders. Then setup your SMTP port preferences again, quit Mail and restart to see if they stick. If they do, you can delete the old com.apple.mail.plist file.

Error 550 5.7.1 unable to relay with SMTP PORT 25 Exchange 2013

Hi All,
I know this issue has been posted for a while, but still can't resolved issue. We've new Exchange 2013 SP1 (CU4) installation, everything is working properly, the OWA, Exchange Client Connection, SMTP/POP with SSL, except with SMTP Using Port 25 Non-Encrypted
Connection.
If I'm using the SMTP Port 25 without TICK "My Outgoing Server (SMTP) Requires authentication", I've got the error: "550 5.7.1 Unable to relay", but if I TICK the option above, my message will be deliver without any error, how do i get
rid this problem, I need to UN-TICK the option above for the time being, since we've hundreds email account, I want to avoid to educate and tell the user and even remote their PC, just to configure this issue, it will drive me crazy, we're going to use the
Exchange Client Connection in the future, If everything is smooth and ok.
I research this problem on the Internet and of course with TECHNET, but still can't, anyone can help me on this?
fyi, I tried so many things, delete the default the Default Front End Transport for Port 25, it also not fix my issue.
Thx
Irwan

Hi
You can paste the output of below result
Get-receiveconnector | fl name,bindings,PermissionGroups
I think your default receive connector should be missing out some permissions.
Also try to see if you get any message on protocol logs and paste them too
Remember to mark as helpful if you find my contribution useful or as an answer if it does answer your question.That will encourage me - and others - to take time out to help you Check out my latest blog posts on http://exchangequery.com Thanks Sathish
(MVP)

Mailserver using non-standard smtp port

how do i set SMTP to accept connections on a non-standard port (i.e. 2525 or something)?
i'm running a mail server and my residential isp (comcast) after ten years of peaceful coexistence decided that they need to block port 25. so i am setting up a commercial store/forward mail relay service. all i need to do is set up my snow leopard server to accept incoming connections on a port other than 25. sounds easy. it is mentioned in the docs thusly:
"By default SMTP is enabled on port 25. If port 25 is blocked in your environment,
you need to change the port SMTP uses."
... but that's all i can find. specifically, it doesn't say exactly how to change the port.
any help appreciated.

following up to my own post. hoping this info may be useful for others who face the same issue who are running a server and then having email ports blocked by their ISP's.
i worked around this by signing up for a mail relay service (i use the one provided by dnydns.com). they forward incoming mail for my domain over a nonstandard port.
since i never received an answer to my question about how to make SnowLeopardServer email server accept SMTP connections on other ports, i simply used port mapping in my router (Airport Extreme) to redirect this port (i used 2525) on my WAN address to port 25 on my server - an acceptable workaround.
i also did the same port redirection for the other "standard alternative" smtp ports, 465 and 587.
since my ISP blocks port 25 in both directions, i also needed to find a work-around for outgoing mail as well. previously, my mail server simply forwarded to my ISP's smtp server (using the default port 25). here the Server Admin interface worked but with one "trick": under Mail>Settings>General, i left the box for "Relay outgoing mail through host:" checked, and in the field there i put "[smtp.myispdomain.net]:587" (that is with square brackets, and a colon, but no double-quotes - and of course, use your own smtp server's domain name). afaik this is not documented anywhere in the apple-provided docs, but i found the corresponding docs for postfix, and reverse-engineered it.
so now i can read (via IMAP) and send (via SMTP) mail from my home server, both when i am on my LAN and when i am accessing remotely, and effectively work around the bi-directional block of port 25 imposed by my ISP.
i'd still like to know if there is a method of configuring smtp to accept connections on ports other than 25. i can see how to do it by editing /etc/postfix/master.cf, but afaik that file gets overwritten by Server Admin...

Multiple SMTP ports on one GWIA??

We currently are running SMTP on port 25 in GWIA and I have no intention of changing that, for obvious reasons. However, one of the big residential network providers in the area (AT&T/Bellsouth) has a policy of blocking traffic to port 25 on their network to anything but their own server, at least for residential accounts. Due to some of what I'll call legacy issues, we have a good number of users who are just using POP3/IMAP and want to be able to check their mail from home.
What I'd really like to do is to make another SMTP port available, say 26, which would get around Bellsouth's block. (I know that should work; I also have Bellsouth at home and use port 26 with another domain provider that I use personally.) In the GWIA properties on GroupWise > Network Address, however, it looks like I can only set one SMTP port. In this case, it would even work if the second port required SSL, but while separate ports seem to be available for POP, IMAP and LDAP they aren't available for SMTP. I've been telling users to just use the GWWA we have set up, but some of the big shots in the company want to use browsers on tablets that don't like the GWWA, so it'd be really nice if I could just get them to work with SMTP even when they're at home and on Bellsouth.
Any suggestions for how I can get GWIA to listen for SMTP on two ports, 25 and some other port, whether or not that other port requires SSL or not? Is there some manual config file I can override the default ConsoleOne settings with? If there are any recommended tricks I'd love to hear 'em... thanks in advance!
topher

In short, you can't - it is an enhancement request that I and others
have had for some time...
On the other hand if you create a second GWIA, change that so that it
listens on 587 (SMTP Submission Port) with SSL Required and then have
it relay out via your other GWIA you will achieve what you want.
However, please PLEASE ensure that the POP, IMAP and SMTP all have the
SSL set to required so that your users do not send user names and
passwords in clear
Thanks
On Wed, 30 Nov 2011 18:06:01 GMT, toforama
<[email protected]> wrote:
>
>We currently are running SMTP on port 25 in GWIA and I have no intention
>of changing that, for obvious reasons. However, one of the big
>residential network providers in the area (AT&T/Bellsouth) has a policy
>of blocking traffic to port 25 on their network to anything but their
>own server, at least for residential accounts. Due to some of what I'll
>call legacy issues, we have a good number of users who are just using
>POP3/IMAP and want to be able to check their mail from home.
>
>What I'd really like to do is to make another SMTP port available, say
>26, which would get around Bellsouth's block. (I know that should work;
>I also have Bellsouth at home and use port 26 with another domain
>provider that I use personally.) In the GWIA properties on GroupWise >
>Network Address, however, it looks like I can only set one SMTP port.
>In this case, it would even work if the second port required SSL, but
>while separate ports seem to be available for POP, IMAP and LDAP they
>aren't available for SMTP. I've been telling users to just use the GWWA
>we have set up, but some of the big shots in the company want to use
>browsers on tablets that don't like the GWWA, so it'd be really nice if
>I could just get them to work with SMTP even when they're at home and on
>Bellsouth.
>
>Any suggestions for how I can get GWIA to listen for SMTP on two ports,
>25 and some other port, whether or not that other port requires SSL or
>not? Is there some manual config file I can override the default
>ConsoleOne settings with? If there are any recommended tricks I'd love
>to hear 'em... thanks in advance!
>
>topher

Help!! Cant send email how change my outgoing smtp port to 587 stuck on 25

Im on OSX 10.1.4. I go to Mail, Preferences, Account, Select my email account, Select Edit, Select Account Options.
All I see is a box saying Connect to server port: and it says 143.
When I try to send mail a message says smpt port timed our port 25. I called my internet provider and they told me to change my outgoing port to 587 but I cant find where to change the 25 to 587.
If I go back to the above and change the 143 to 587 my incoming mail stops working.
Am I looking in the wrong place or did I setup my email incorrectly? I selected mac account, pop, smtp.mac.com outgoing server, mail.mac.com for incoming server...did I do something wrong. I have a mac mail email address.
Please someone help me!!
Thanks.

So there's no way to send with other ports? You HAVE to use port 25?
Sure there is - talk to every mail administrator of every domain you might ever want to send mail to and have them reconfigure their mail servers to listen on some arbitrary port number that you define. Wait for them to do it (it shouldn't take them too long), and then you're done.
Oh, no, hang on a minute... none of them are going to do that, are they?
But that's what you're asking for - you're asking for them to accept mail on some non-standard port number just so you can get around Verizon's mail blocking.
There is a reason why standard port numbers (defined by IANA) exists - just so that everyone's talking on the same page (or at least in the same chapter of the same book). You can't arbitrarily pick a port number and expect it to work unless both sides of the connection know to use it. You know port 25 works for SMTP because that's the standard. You can use any port number you like for your own mail because you can configure your own mail client to use a non-standard port, but you can't convince the rest of the world to follow suit (at least not without good reason).
In this case your options are to relay your mail through Verizon's servers, upgrade to their business plan (which supports hosting your own mail server and doesn't break the user agreement), or setup another mail server somewhere else that you can relay your mail through.

Sending email using IMAP through SMTP Port 587

Hi,
I have been sending Mail Merged email to people in organizations that I am active in, using IMAP embedded in StarOffice 5.2 (on Windows 98 Second Edition). This worked fine until a few weeks ago when I received an error message stating that AOL, as part of their anti-spam efforts, was no longer accepting third-party emails on default port 25. All third-party email must now use port 587. I looked in the IMAP dialog and in the Tools -> Options dialog, but did not see any place to change the SMTP port. The AOL error message information page had instructions for changing the port in other applications (Outlook, Eudora, etc.), but not for StarOffice. So, I have some questions:
1.Is it possible to change the port in StarOffice 5.2?
2.If not, how does StarOffice 8 send Mail Merged email? Does it use IMAP, and if so, can the port be changed?
3.Also, I like the integrated configuration in StarOffice 5.2, where database fields can be directly accessed in the Insert -> Fields -> Other dialog. In looking at the Mail Merge section in "SO8_What's New.pdf", it appears that Mail Merge in StarOffice 8 is restricted to predefined fields. Could I still access fields from my existing databases?
These is a lot of questions, but right now I am blocked from sending Mail Merged emails which is imparing communications with volunteers who are running educational programs. I appreciate any and all help that anyone can provide.

Please try this out!!!!!!!!!
You can send emails using Outlook also. You can send email over Microsoft Exchange with this object (or another email server, using IMAP/POP).
Sub SendMailOutlook(aTo, Subject, TextBody, aFrom)
'Create an Outlook object
Dim Outlook 'As New Outlook.Application
Set Outlook = CreateObject("Outlook.Application")
'Create e new message
Dim Message 'As Outlook.MailItem
Set Message = Outlook.CreateItem(olMailItem)
With Message
'You can display the message To debug And see state
'.Display
.Subject = Subject
.Body = TextBody
'Set destination email address
.Recipients.Add (aTo)
'Set sender address If specified.
Const olOriginator = 0
If Len(aFrom) > 0 Then .Recipients.Add(aFrom).Type = olOriginator
'Send the message
.Send
End With
End Sub

How do I set up an account to receive email from my SMTP relay Server. Have I made a SMTP Server config error?

Hi,
How do I set up an account to receive email from my SMTP Relay Server?
I've setup the SMTP feature and set my Server to use anonymous authentication.
Things appear to look ok.
But I can't connect make a test connection to it when I am trying to add an email account in Outlook.
I could be doing something wrong here.
This is my process.
1. I have setup my SMTP Server.
2. Created a user account in AD and given it an email address.
3. Opened Outlook and tried to manually add a POP3 account by specifying the incoming and outgoing Server details.
But when I go to test the connection on the email setup it keeps failing.
Please help.
Thanks

Hi Midi25,
As Florent suggested, please use Telnet to test SMTP Communication. For more details, please refer to following articles.
How to Use Telnet to Test SMTP Communication
XFOR: Telnet to Port 25 to Test SMTP Communication
In addition, please also refer to following article and check if can help you.
How to Configure a Windows Server 2003 Server as a Relay Server or Smart Host
Best regards,
Justin Gu
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]

Smtp;550 5.7.1 Unable to relay #SMTP#

our dev wrote a script that'll send an email externally but it bounces with the following error:
smtp;550 5.7.1 Unable to relay> #SMTP#
Your message wasn't delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept e-mail from certain senders, or another restriction may be preventing delivery.
It works fine if I want to send the email internally tho. The server is on the allowed list on the receive connector and anonymous users is checked in the permissions groups tab
using exchange 2010 SP3

Hi Cinekc,
Besides SSorin's suggestion, I would like to clarify the following things:
1. Please use telnet to port 25 to test SMTP communication. Here is a thread for your reference.
Exchange server unable to send mail outside
http://social.technet.microsoft.com/Forums/exchange/en-US/ce90b2ea-d2d2-4f15-ab56-43da021c52c9/exchange-server-unable-to-send-mail-outside?forum=exchange2010
2. Please contact recipient side to verify if there is any limitation. What's more, I recommend you ask the recipient side add yourdomain.com into "The sender's domain is" exception of Anti-Spam transport rule and check the result.
Here is a thread for your reference.
Exchange 2013 reject message with unintelligible reason
http://social.technet.microsoft.com/Forums/exchange/en-US/e4c19d74-460e-46ff-81bb-e97dedfcec93/exchange-2013-reject-message-with-unintelligible-reason?forum=exchangesvradmin
Hope it helps.
If there are any problems, please feel free to let me know.
Best regards,
Amy
Amy Wang
TechNet Community Support

Alert emails to a non standard SMTP port

Is it possible to configure LiveCycle ES 8.2 to send its alert emails to an SMTP server on a non standard port? In the AdminUI there is a field for the server but not for the port.
Thanks,

Hi Jon
Sorry, I thought we were talking about Task Notifications not Administrator Notifications.
Changing the port in the Email Notifications process will work for Task Notifications.
Administrator Notifications use the Java mail default, which is port 25 unless otherwise specified on your system.
Are you using the JBoss Turnkey?
if so, you can try this:
1. Navigate to C:\Adobe\LiveCycle8.2\jboss\server\all\deploy
2. Locate the properties-service.xml file.
3. uncomment the following block and set the property as follows:
    
    <attribute name="Properties">
          smtp.mail.port =<your port #>
    </attribute>
4. You don't need to restart JBoss.
The only downside is that this is now the smtp port for that server and any other apps on that server.
If you can live with that, it's an easy workaround.
Diana

Change smtp port from 25 to 26

Hello.
My ISP is blocking my smtp port 25, so I have been using port forward in my airport. 26-25. The DNS is set up til contact me on port 26.
Now I have a new router, and it doesn't have that feature, so I would like to have my mac server to listen on port 26 as smtp instead.
How do I change that?

You need to add a second listener to your mail server by editing the /etc/postfix/master.cf file. You must do this as root and using a command line editor is recommended. Make a backup of the file first. You do not need to stop mail services to edit the file but you will need to stop and then start mail to make the change recognized.
The line you need to add should look like this:
26 inet n - n - - smtpd
Test it internally after restarting mail services with a:
telnet localhost 26
Hope this helps

Consequences of using non-traditional SMTP ports

I'm at an educational institution, and I'm trying to set up a server (Xserve with Mac OS X 10.5.4 Server) within the institution firewall. However, the traditional SMTP (25,587) and IMAP (143,993) ports are blocked so I can't set my mail server to use any of them. The institution has agreed to open up some other ports (22,115,623). Are there any consequences to setting up our mail server using one of these ports?

Could you use port forwarding? sure, although that's overkill if you can put a machine up on the outside of the firewall - just setup a mail server on the outside that knows to forward mail to a port number that the network admins will allow in.
Set your DNS so that your domain's mail goes to the machine on the outside. This machine accepts the mail and forwards it to whatever port number you define on your internal machine. It adds an extra hop in the mail loop but it's entirely feasible, e.g.:
Remote_domain -> outside_machine:25 -> firewall -> inside_machine:623
No remote user needs to know about your inside machine running on a different port number since they only need to talk to the outside_machine that's listening on the standard port.
Now, should you do this? I can't say but I'm sure it's going to fall into the realm of network abuse and the network admins might not appreciate it. That's your call.

How To Configure non-standard SMTP port

My ISP has blocked port 25. I have a service that will deliver mail to the port of my choosing. How do I configure Leopard Server to listen on a non-standard SMTP port? 2525 for example.
Also, I assume all I have to do on my Airport Express is set up NAT to rake external port 2525 and point it to the private address of my email server on port 2525. Is this correct?
Thanks,
-ernie

Assuming such is offered, look to acquire a business-class ISP service level, and move on to the next issue? The business-class services typically provide static IP address(es), opens up server ports, and sets up DNS and ISP-side server connections for your hosts. And you can call your ISP or other assistance when your network craters; non-standard connections are (as you've found) harder to support.
One subtlety here: in a number of cases, simply having a business-class service means you're supported by a different group within (larger) ISPs. This can be a significant advantage at times, given that the scripts and tools and such that are available for the business group will be rather more targeted than the scripts that are available for the residential services group at the ISP.
There are a number of folks that have sought and have tried this (try a few Google searches for SMTP and non-standard port), and it mostly works. But it is fragile, and tends to be derailed when something goes weird, or when the ISP spots and shapes or blocks the server traffic.
Also check your ISP's terms of service here, lest your network pipe be subject to summary disconnection.
The other option is to VPN or tunnel into to a co-lo or dedicated server or a virtual hosting service; to run your servers or virtual servers somewhere without firewalls blocking the standard ports.

Problem sending emails on SMTP Port 25 with Z10

Hi Blackberry,
Its very disappointing that new Z10 cannot configure my business email. I can receive the email but cannot reply or send emails. There is a serious issues with the SMTP Ports with this device. Blackberry should resolve this issue earliest or die hard fans of blackberry like me shall be done with it. Z10 does not configure on SMTP Port 25. Please resolve this issue asap.

Port 25 is blocked on most ISPs now. you need a SSL type of connection to make it work everywhere.
this is not a BlackBerry problem really, the world of email has changed and port 25 should never be used by any mobile client
what mail server is this using? maybe you can configure a new port or even use IMAP or EAS which is much better for mobile use
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Sending mails: port 25 blocked

Dear All,
I am programming an application that sends emails
using the port 25 of an SMTP sever. The server I used
for tests allow to use this port. However, when I try
to use this port for sending emails the most part of SMTP servers
are blocking this port to avoid SPAM. Anybody knows any solution
to this problems?
Cheers,
Ernest

You should really only be sending emails from SMTP servers that you have an account on. They will check the from address to make sure that it is a valid email account on the system, before accepting the email. If you do have an account on the server, the administrator (or ISP) will tell you which port it is on, but I think that it will almost always be 25.
Another issue that you might be encountering is a firewall that is blocking port 25. If so, it is probably not be your SMTP server that is blocking you, but the IT folks in your company that control access to and from the Internet. You should ask them about this. It is possible, depending on your IT depts policies, to have the port opened for specific domains or IP Addresses behind the firewall.
Go
od luck,
Jim

SMTP Port 25 blocked to my own relay server?

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