[NTLUG:Discuss] Postfix SMTP AUTH relay host

[Daniel Hauck]

Well, I didn't give up and kept looking around and found this:

http://www.postfix.org/postconf.5.html#relayhost

Specifically, I added this line to my /etc/postfix/main.cf

smtp_sender_dependent_authentication = yes


It works now...!


Daniel Hauck wrote:
> My brain is tired and I'm not making the right progress.
> 
> I followed the instructions from here:
> 
> http://www.postfix.org/SASL_README.html
> 
> And I now have a test SMTP authentication session that seems to be 
> working.  But now I'm lost as to how to get the mail host to relay 
> outwardly.  Here's a sample session:
> 
> --------------------
> [user at host ~]$ telnet 192.168.3.17 25
> Trying 192.168.3.17...
> Connected to 192.168.3.17.
> Escape character is '^]'.
> 220 mailer.domain.com ESMTP Postfix
> helo domain.com
> 250 mailer.domain.com
> AUTH PLAIN AHNtdHAtdXNlcgBaYXExMndzeA==
> 235 2.0.0 Authentication successful
> MAIL FROM: user at domain.com
> 250 2.1.0 Ok
> RCPT TO: user at domain.com
> 550 5.1.1 <user at domain.com>: Recipient address rejected: User unknown in 
> local recipient table
> --------------------
> 
> I did another test as follows:
> 
> --------------------
> [user at host ~]$ telnet 192.168.3.17 25
> Trying 192.168.3.17...
> Connected to 192.168.3.17.
> Escape character is '^]'.
> 220 mailer.domain.com ESMTP Postfix
> helo domain.com
> 250 mailer.domain.com
> AUTH PLAIN AHNtdHAtdXNlcgBaYXExMndzeA==
> 235 2.0.0 Authentication successful
> MAIL FROM: user at domain.com
> 250 2.1.0 Ok
> RCPT TO: smtp-user at domain.com
> 250 2.1.5 Ok
> data
> 354 End data with <CR><LF>.<CR><LF>
> subject: testing
> this is a test
> just a test
> only a test
> .
> 250 2.0.0 Ok: queued as 54A4FF05C1
> quit
> 221 2.0.0 Bye
> --------------------
> 
> The difference is that "smtp-user" exists on the local machine.  What 
> I'd like this configuration to do is relay for authenticated users only 
> to anywhere.
> 
> How do I do that?
> 
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