Mails working randomly

[xelios]

Hello.

I configured a Debian server with ISPConfig following the complete guide "The Perfect Setup - Debian Etch".
I host several sites on this server. Websites are working but that's not the case concerning emails.

Imagine I have two websites, emails should be like this :

1. first.com : using Google Apps :
   • Remote Mailserver
   • no Mx record
2. second.com : redirects to first.com's Google Apps :
   • Local Mailserver
   • MX record
   • Email redirection in the user ISP settings

The problem is that it seems to work randomly. Once it redirects and everything is ok, once it gives

<user1@first.com> (expanded from <user2@second.com>): unknown user: "user1"

Any clue about this ? I completely re-installed the private server twice but it still doesn't work. Thank's a lot.

PS : sorry if my English is bad. ;-)

[xelios]

I just made a quick test. I sent 4 mails to the same second account. The result is :

• 2 mails well redirected
• 1 mail was in the local inbox (RoundCube)
• 1 mail gave an "undelivered..."

What happens ?? How is it possible ?

[falko]

What's in the mail log when an email ends up in the local inbox and when you get an "undelivered"?

[xelios]

Thank you for the answer.

Well, right now I don't receive them locally on the server. Only "undelivered" :

Dec 28 13:41:06 imapd: Connection, ip=[::ffff:127.0.0.1]
Dec 28 13:41:06 imapd: LOGIN, user=befox, ip=[::ffff:127.0.0.1], protocol=IMAP
Dec 28 13:41:07 imapd: LOGOUT, user=befox, ip=[::ffff:127.0.0.1], headers=0, body=0, rcvd=46, sent=432, time=0
Dec 28 13:41:30 postfix/smtpd[17075]: connect from web25806.mail.ukl.yahoo.com[217.12.10.191]
Dec 28 13:41:30 postfix/smtpd[17075]: E4659FE249: client=web25806.mail.ukl.yahoo.com[217.12.10.191]
Dec 28 13:41:30 postfix/cleanup[17078]: E4659FE249: message-id=<803955.20385.qm@web25806.mail.ukl.yahoo.com>
Dec 28 13:41:31 postfix/qmgr[16604]: E4659FE249: from=<>, size=1781, nrcpt=1 (queue active)
Dec 28 13:41:31 postfix/smtpd[17075]: disconnect from web25806.mail.ukl.yahoo.com[217.12.10.191]
Dec 28 13:41:31 postfix/cleanup[17078]: 22A90FE24A: message-id=<803955.20385.qm@web25806.mail.ukl.yahoo.com>
Dec 28 13:41:31 postfix/qmgr[16604]: 22A90FE24A: from=<>, size=1911, nrcpt=1 (queue active)
Dec 28 13:41:31 postfix/local[17079]: E4659FE249: to=<befox@r16648.ovh.net>, orig_to=<user2@second.com>, relay=local, delay=0.31, delays=0.21/0.01/0/0.09, dsn=2.0.0$
Dec 28 13:41:31 postfix/qmgr[16604]: E4659FE249: removed
Dec 28 13:41:31 postfix/local[17079]: 22A90FE24A: to=<user1@first.com>, orig_to=<user2@second.com>, relay=local, delay=0.24, delays=0.08/0/0/0.15, dsn=5.1.1, sta$
Dec 28 13:41:31 postfix/cleanup[17078]: 5C7D7FE24D: message-id=<20081228124131.5C7D7FE24D@r16648.ovh.net>
Dec 28 13:41:31 postfix/qmgr[16604]: 5C7D7FE24D: from=<>, size=3658, nrcpt=1 (queue active)
Dec 28 13:41:31 postfix/bounce[17080]: 22A90FE24A: sender non-delivery notification: 5C7D7FE24D
Dec 28 13:41:31 postfix/qmgr[16604]: 22A90FE24A: removed
Dec 28 13:41:31 postfix/smtp[17081]: 5C7D7FE24D: host c.mx.mail.yahoo.com[216.39.53.3] refused to talk to me: 421 Message from (91.121.203.172) temporarily deferred$
Dec 28 13:41:32 postfix/smtp[17081]: 5C7D7FE24D: to=<>, relay=b.mx.mail.yahoo.com[66.196.97.250]:25, delay=1.2, delays=0.13/0.01/0.45/0.56, dsn=2.0.$
Dec 28 13:41:32 postfix/qmgr[16604]: 5C7D7FE24D: removed

Plus, if I ask for a redirection to a normal Gmail address, it works fine.

But it doens't work with a Google Apps account with MX configured on the server. It seems the server looks for the Google Apps account (user1@first.com) on the the server, in the undeliverd mail :

<user1@first.com> (expanded from <user2@second.com>): unknown user: "user1"

[falko]

Dec 28 13:41:31 postfix/smtp[17081]: 5C7D7FE24D: host c.mx.mail.yahoo.com[216.39.53.3] refused to talk to me: 421 Message from (91.121.203.172) temporarily deferred$

Please make sure your server isn't blacklisted: http://mxtoolbox.com/blacklists.aspx

[xelios]

Checked. No, it isn't blacklisted...

[falko]

Do your email domains have SPF records? Does your mail server have a PTR record?