Creating a mail server from an SMTP feed

Currently, we are unsatisfied with our mail provider
- mostly due to delayed mail receipt. After speaking
to our ISP they advised us that we could set up our
own mail server and they could stream SMTP to us,
avoiding POP3.
Although I administer the server and the network I
have no experience of mail servers and have a few
questions. I would have searched the forum but I
don't really know which terms to search.
I would very much appreciate a fairly full
explanation and nothing too vague please.
1. Is this easy to set up without additional
hardware/software - is it built-in to OSX Server?
What is it called and is it only accessed through
CLI? Is there a good GUI alternative?
Sorry for the 'vague' answer but it's called "Mail" in Server Admin app - presumably the application you are using to administer your server? You can find documentation on it in the Mail Service section here...
http://www.apple.com/support/macosxserver/index.html
Apple docs are not everyones cup of tea but they are the starting point.
There are also other 3rd party mail server apps you can run in place of the built-in one.
2. What hardware/software would you recommend for a
facility handling about 200-300 emails per day, most
with attachments of around 1Mb? It is not unusual to
exceed 1Gb of email bandwidth in a working day.
A G4 could do that easily - depending (of course) on what else it is doing.
3. What problems/shortfalls do I need to be aware of?
Fequent crashes, database rebuilding, common address
books, support, missing/undelivered/undeliverable
mail, client set-up, etc
It just runs fine. Any time I have had problems it is because I have 'fiddled', but it is still a bit of software and you therefore become responsible for it (rather than your ISP/mail provider). "Common address books" is not a function of the OS X mail server. The mail logs are there for tracking whether "missing" mail was actually sent/delivered. Client set up is just as per usual requirements except you point clients to your server rather than ISP's.
4. How will our email change, both sending and
receiving? Will we or our recipients notice any sort
of change?
Sending from within the same LAN as your server appears a lot faster to people on the LAN since the transfer to the server is within LAN rather than out to internet. The server then sends out to internet.
Apologies again for the possibly not "full" answers but if I did that I would end up writing a manual
-david

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event manager environment [email protected]
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action 1.0 mail server "smtp.gmail.com" to "[email protected]" from "[email protected]" subject "E2E up/down" body "DSL is UP"*
* I use several possible key combinations:
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event manager environment [email protected]:[email protected]
action 1.0 mail server "[email protected]:[email protected]" to "[email protected]" from "[email protected]" subject "E2E up/down" body "DSL is UP"*
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Mail Server issues: non-SMTP command from localhost

I just installed Yosemite server. Noticed these messages showing up in the log:
Oct 28 06:32:08 my_server.net postfix/smtpd[28380]: warning: non-SMTP command from localhost[127.0.0.1]: From: Mrs. M.M Macheda <[email protected]>
Oct 28 06:32:08 my_server.net postfix/smtpd[28382]: warning: non-SMTP command from localhost[127.0.0.1]: From: Mrs. M.M Macheda <[email protected]>
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Oct 28 06:32:08 my_server.net postfix/smtpd[28382]: disconnect from localhost[127.0.0.1]
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Oct 28 06:32:08 my_server.net postfix/smtpd[28386]: connect from localhost[127.0.0.1]
Oct 28 06:32:08 my_server.net postfix/smtpd[28386]: improper command pipelining after EHLO from localhost[127.0.0.1]: MAIL FROM:<[email protected]>\\r\\nRCPT TO:<[email protected]\\r>\\r\\nDATA\\r\\nFrom: Mrs. M.M Macheda <he
Here is output of postconf -n
biff = no
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
debug_peer_level = 2
debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin ddd $daemon_directory/$process_name $process_id & sleep 5
html_directory = /usr/share/doc/postfix/html
inet_interfaces = loopback-only
inet_protocols = all
mail_owner = _postfix
mailbox_size_limit = 0
mailq_path = /usr/bin/mailq
manpage_directory = /usr/share/man
message_size_limit = 10485760
mynetworks = 127.0.0.0/8, [::1]/128
newaliases_path = /usr/bin/newaliases
queue_directory = /private/var/spool/postfix
readme_directory = /usr/share/doc/postfix
recipient_delimiter = +
sample_directory = /usr/share/doc/postfix/examples
sendmail_path = /usr/sbin/sendmail
setgid_group = _postdrop
smtpd_client_restrictions = permit_mynetworks permit_sasl_authenticated permit
smtpd_tls_ciphers = medium
tls_random_source = dev:/dev/urandom
unknown_local_recipient_reject_code = 550
Except me nobody has access to the server yet. Nobody is sending out any emails. Appreciate any help.

What does /var/log/mail.log have to say (you may need to increase logging level to "Information")?

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I have managed to migrate all accounts from 10.5 to 10.6 using this command:
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Apr 25 11:51:49 server postfix/cleanup[5261]: 9CA88497F7: message-id=<[email protected]>
Apr 25 11:51:49 server postfix/smtpd[5266]: disconnect from localhost[127.0.0.1]
Apr 25 11:51:49 server postfix/qmgr[5212]: 9CA88497F7: from=<[email protected]>, size=1219, nrcpt=1 (queue active)
Apr 25 11:51:49 server postfix/smtp[5262]: 1211F497EA: to=<[email protected]>, relay=127.0.0.1[127.0.0.1]:10024, delay=3.6, delays=0.03/0.02/0.01/3.6, dsn=2.0.0, status=sent (250 2.0.0 Ok: queued as 9CA88497F7)
Apr 25 11:51:49 server postfix/qmgr[5212]: 1211F497EA: removed
Apr 25 11:51:49 server postfix/smtp[5268]: 9CA88497F7: to=<[email protected]>, relay=none, delay=0.11, delays=0.01/0.01/0.09/0, dsn=5.4.4, status=bounced (Host or domain name not found. Name service error for name=domain.com type=A: Host found but no data record of requested type)
Apr 25 11:51:49 server postfix/cleanup[5261]: BF17E497F9: message-id=<[email protected]>
Apr 25 11:51:49 server postfix/bounce[5269]: 9CA88497F7: sender non-delivery notification: BF17E497F9
Apr 25 11:51:49 server postfix/qmgr[5212]: BF17E497F9: from=, size=3347, nrcpt=1 (queue active)
Apr 25 11:51:49 server postfix/qmgr[5212]: 9CA88497F7: removed
Apr 25 11:51:49 server postfix/smtp[5268]: BF17E497F9: to=<[email protected]>, relay=none, delay=0, delays=0/0/0/0, dsn=5.4.4, status=bounced (Host or domain name not found. Name service error for name=domain.com type=A: Host found but no data record of requested type)
Apr 25 11:51:49 server postfix/qmgr[5212]: BF17E497F9: removed
Apr 25 11:52:46 server postfix/smtpd[5253]: disconnect from unknown[172.16.0.22]

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Creating a mail server from an SMTP feed

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