ISPConfig possible e-mail problems

[mr_bo]

Hi, I am running ispc3 all ok on centos 5.3 but one thing niggles me, some e-mail recipiants do not receive mails. At a guess i would say 10% ish of mails do not get delivered.

What reason could that be? I am not blacklisted and port 25 is not blocked.

[till]

Look at your mail log and the spamfiltering settings.

[mr_bo]

Hi Till,

The spam filter is not enabled and in the mail log I can find the section for a known recipient that does not receive mails but don't really know what to look for.

Also don't want to post it publicly but if you would take a look by pm it would be appreciated.

Thanks.

[till]

I'am sorry, I dont offer free support by pm. You can either post the info here or order contact us trough the ispconfig.org website if you like to get commercial support.

[mr_bo]

Appreciate your comments there till, can you suggest anything obvious for me to look at?

Thanks in advance.

[till]

Compare the lines for delivered emails with the lines for not delivered emails to find the differences.

[mr_bo]

Right, I have studied the log files for a known delivered mail and a known undelivered mail and all I can see is right at the end of the log for the undelivered mail is:

relay=mx1.bt.mail.yahoo.com[195.50.106.135]:25, delay=1.9, delays=0.06/0.1/1.2/0.58, dsn=2.0.0, status=sent (250 ok dirdel)

And for the delivered mail:

relay=mail-xxx.com[xxx.xxx.xxx.xxx]:25, delay=1.6, delays=0.06/0.03/0.98/0.49, dsn=2.0.0, status=sent (250 ok:  Message 460732577 accepted)

Does this mean anything? As the rest of the logs look ok to me.

Thanks in advance.

[till]

Both emails are delivered correctly (status 250 ok). The delivery of the firts mail was accepted by the yahoo server, so if the mail does not show up in your yahoo account, it has been filtered by a spamfilter at yahoo.

To prevent that other providers filter out your email, make sure that your IP is not blacklisted and that you have a correct PTR record for the IP of your server.

[mr_bo]

Thanks till, I think PTR needs looking at as currently has been overlooked.

In the ispc dns manger can you please tell me what goes in each field. I have tried looking but get confused with reverse dns stuff.

[till]

The reverse record has most likely to be set in the dns server of the provider that assigned you the IP address and not in your local dns server. Ask your provider to set this for you in his dns server.