Question External SMTP Server

[guiman]

Hello,

I use our external email-provider (Host Europe) to send all emails which are generated by our Plesk Server. That worked fine for many months.

But now some major email providers like gmail or gmx stopped delivering our mails to the recipients without any notification. The emails get lost so we dont have a header. Hotmail is still delivering those emails and in the header I found entrys like that:

X-bounce-key: our-domain-name@@localhost.localdomain
Return-Path: our-domain-name@@localhost.localdomain

Maybe that is the issue?

In Plesk I have set a hostname - so I dont know where this "localhost.localdomain" info comes from. Our Email-Provider confirms that they do not generate such a setting. When we send an email from Outlook with the same SMTP-Server, everything is ok.

Do I have a problem in Plesk or does our Email-Provider have a problem? Or is it maybe related to SPF entrys?

 

[hardbrasil]

check
- PTR reverse of IP
- spf record

check on dnsstuff if there is some misconfiguration
dnsstuff.com

Into Plesk there is an option on "tool and settings" / mail settings / try this -> Send from domain IP addresses and use domain names in SMTP greeting

 

[guiman]

PTR and spf are ok.
DNSstuff has a warning which coud be the issue: The hostname in the SMTP greeting does not match the reverse DNS (PTR) record for your mail server

The hostname in the greeting is "localhost" because as explained above, I use an external SMTP which is set in Plesk. Plesk does not let you set a hostname for the external SMTP.

I dont have Mail Settings in my Plesk because I have not installed any mailserver - so the solution "Send from domain IP addresses and use domain names in SMTP greeting" does not work for me.

Is there a chance to fix it with DNS Settings?

 

[hardbrasil]

have you tryed third option "Send from the specified IP addresses"

take a look on this function
Plesk Multi Server