Re: Postifx as SMTP AUTH client
- From: Todd Zullinger <tmz@xxxxxxxxx>
- Date: Mon, 10 Apr 2006 15:22:01 -0400
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J. K. Cliburn wrote:
I'm pretty new to configuring mail servers, and I'm running into[...]
issues trying to get outbound mail to work. I've configured Postfix
to (I think) request smtp auth at my ISP's mail server in an attempt
to get him to relay my mail, but I'm not sure the authentication
attempt is happening.
A few background items...
1) PPPoE DSL connection, dynamic IP.
2) DynDNS/ddclient correctly working to keep domain name and IP
address in sync.
3) Postfix on home LAN server correctly configured to send and receive
internal mail.
Interestingly, here's a telnet session with the ISP's mailserver:
[root@osprey ~]# telnet 205.152.58.33 25
Trying 205.152.58.33...
Connected to 205.152.58.33.
Escape character is '^]'.
220 ibm30aec.bellsouth.net ESMTP server ready Mon, 10 Apr 2006 13:28:30 -0400
EHLO bellsouth.net
250-ibm30aec.bellsouth.net
250-HELP
250-PIPELINING
250-DSN
250-8BITMIME
250 SIZE 26214400
AUTH PLAIN <<<base64-encoded-username/password>>>
502 Command is locally disabled
quit
221 ibm30aec.bellsouth.net ESMTP server closing connection
Connection closed by foreign host.
What does the response "Command is locally disabled" mean? I'm
confused by it, because the ISP requires that I authenticate when I
check my personal mail. How could the AUTH command be disabled at
his end in this case?
AUTH can be disabled for PLAIN text, but enabled for more secure forms
of authentication. However, I don't see any AUTH advertised there.
I have setup postfix as both server and client doing AUTH, with very
old versions of postfix. On the server end I disabled AUTH unless the
connection was TLS encrypted. But looking at your telnet session, I
don't see STARTTLS advertised.
I'm missing something really fundamental. Any hints or pointers
appreciated.
In addition to the things Alexander said, something I'd do to help
debug this is setup a mail client to send mail directly through your
ISP. What settings are required there? If you have to setup SMTP
AUTH for that, then you will for postfix as well. If not, then the
problem lies elsewhere in your postfix config.
(Note, as Alexander pointed out that POP3 and IMAP configuration is
totally separate from the SMTP setup.)
If you can get mail sent from another client and your SMTP session
isn't encrypted, you can use Ethereal to sniff the transaction and see
what's different from attempting to send with postfix.
- --
Todd OpenPGP -> KeyID: 0xD654075A | URL: www.pobox.com/~tmz/pgp
======================================================================
I figure that if God actually does exist, He's big enough to
understand an honest difference of opinion.
-- Isaac Asimov
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