Postfix & PLESK: Problems with Delivery

[ehrenwert]

Hello dear PLESK-Team,

I've got one server: Its called "server2.mein-provider.de" this server has got 2 IP-adresses:

- 2xx.7x.1x9.1x4
and
- 8x.3x.1xx.1x0

The Domain "project1.de" uses the IP 8x.3x.1xx.1x0
The Domain "projekt2.de" uses the IP 2xx.7x.1x9.1x4.


Both IP-adresses do have an rdns-record: "server2.mein-provider.de".

If I send a mail from "Versender@projekt1.de" this mail is delivered - and not sorted into the spam-dir...

If I send a mail from "Versender@projekt2.de", this mail is delivered BUT gets sorted into the spam-dir...

The headers are almost equal - there is only one difference:

Working (project1.de)

Received: from server2.mein-provider.de (server2.mein-provider.de [8x.3x.1xx.1x0])

Not working (project2.de)

Received: from server2.mein-provider.de (unknown [2xx.7x.1x9.1x4])

Why is it "unknown" in this line? Isn't that the place where the HELO-output should be?

Thanks a lot for your help!

 

[Nikolay.]

This might be due to DNS misconfiguration for 2xx.7x.1x9.1x4 server, which results in SPF marking your mails as spam. You may check headers of mails from this IP to confirm the guess.