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From: Jan Smitka on 20 Dec 2009 04:32
Hello, everyone,
our company has recently bought a new server and we've switched from an
old Fedora to Gentoo. We are now using the latest stable version of
postfix (2.6.5) with fully virtual users (MySQL) and dovecot LDA.
Everything worked fine when we were testing the configuration in an
small LAN. However, after we put the server into the production
environment yesterday, there is a problem with outgoing e-mails.

When I try to send an e-mail from Thunderbird 3.0 on my machine (Win 7,
x64), it fails with this error message:
The mail server sent an incorrect greeting: .
And in the server's maillog, there are some errors:

Dec 20 09:14:54 server postfix/smtpd[20034]: lost connection after EHLO
from 58.16.broadband2.iol.cz[83.208.16.58]
Dec 20 09:14:54 server postfix/smtpd[20034]: disconnect from
58.16.broadband2.iol.cz[83.208.16.58]

Same problem with Windows Live mail, except it's says only "Unknown
error". I haven't tested any other clients yet and I don't know if I'm
the only one who has problems - we changed the server yesterday and our
clients don't send any e-mails on weekends.

I've put my IP address into debug_peer_list and here's the full log:
http://jan.smitka.org/server/maillog

When I establish and SSH tunnel to another machine, forward my
localhost's port 25 to server's port 25, change my outgoing SMTP server
to localhost:25 and try to send an e-mail, everything works fine. It
looks like it's a problem with EHLO message, because when I send the
mail directly, my client uses EHLO smitka (my workstation's name), but
throught the tunnel it uses EHLO localhost. It's strange, because I
didn't specified any smtpd_helo_restrictions. Full output of postconf -d
is here: http://jan.smitka.org/server/postconf

I've tried to google, but I didn't found any relevant information. Has
anyone any idea where's the problem? Many thanks in advance!


Best regards

--
Jan 'Panda' Smitka,
student a webmaster Gymnázia Děčín,
správce serveru pro EasyComp s.r.o.
ICQ: 299-096-976, Skype: jan.smitka
JID:jsmitka(a)jabber.cz

From: mouss on 20 Dec 2009 05:58
Jan Smitka a écrit :
> Hello, everyone,
> our company has recently bought a new server and we've switched from an
> old Fedora to Gentoo. We are now using the latest stable version of
> postfix (2.6.5) with fully virtual users (MySQL) and dovecot LDA.
> Everything worked fine when we were testing the configuration in an
> small LAN. However, after we put the server into the production
> environment yesterday, there is a problem with outgoing e-mails.
>
> When I try to send an e-mail from Thunderbird 3.0 on my machine (Win 7,
> x64), it fails with this error message:
> The mail server sent an incorrect greeting: .
> And in the server's maillog, there are some errors:
>
> Dec 20 09:14:54 server postfix/smtpd[20034]: lost connection after EHLO
> from 58.16.broadband2.iol.cz[83.208.16.58]
> Dec 20 09:14:54 server postfix/smtpd[20034]: disconnect from
> 58.16.broadband2.iol.cz[83.208.16.58]
>
> Same problem with Windows Live mail, except it's says only "Unknown
> error". I haven't tested any other clients yet and I don't know if I'm
> the only one who has problems - we changed the server yesterday and our
> clients don't send any e-mails on weekends.
>
> I've put my IP address into debug_peer_list and here's the full log:
> http://jan.smitka.org/server/maillog
>
> When I establish and SSH tunnel to another machine, forward my
> localhost's port 25 to server's port 25, change my outgoing SMTP server
> to localhost:25 and try to send an e-mail, everything works fine.

Test using telnet from your client machine and show the results.

$ telnet yourserver 25
EHLO smitka
MAIL FROM:<somesender(a)example.org>
RCPT TO:<somerecipient(a)example.com>
DATA
Subject: test new mail server

blah blah
..
QUIT


> It
> looks like it's a problem with EHLO message,

no, it's not an "EHLO" problem. the problem happens later.
make sure
- the client is not configured to use SSL or STARTTLS, because you did
not configure these, and
- the client is not configured to use an authentication meachnism that
is not enabled/advertized. if you use outlook, better set
"broken_sasl_auth_clients = yes".

other possibilities include a PIX/router/proxy/firewall that doesn't
like ESMTP.

A good resource for troubelshooting (and also for asking for help) is
http://www.postfix.org/DEBUG_README.html

> because when I send the
> mail directly, my client uses EHLO smitka (my workstation's name), but
> throught the tunnel it uses EHLO localhost. It's strange, because I
> didn't specified any smtpd_helo_restrictions. Full output of postconf -d
> is here: http://jan.smitka.org/server/postconf
>

'postconf -d' is rather useless, unless we want to know how your OS
vendors compiles postfix.

send out of 'postconf -n' instead, and please send it inline instead of
posting it on a web site. it should not be that large to require a url..

> I've tried to google, but I didn't found any relevant information. Has
> anyone any idea where's the problem? Many thanks in advance!
>
>
> Best regards
>

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