Issue Emails are delivered incorrectly

[g4marc]

Server operating system version

CentOS Linux 7.9.2009

Plesk version and microupdate number

Plesk Obsidian Version 18.0.44 Update #2

Hi,
we use Plesk as a reseller with our customers' domains and use an external DNS management.
for some customers we have adjusted the mx records in the external dns administration for the use of microsoft exchange.
everything woks well so far.
but if one of the customers on this server sends an email to another customer who is also hosted on the same server (but with the adjusted mx configuration on the external dns), it will be delivered to the local mailbox, but not to the exchange server.

I set the plesk dns to "slave" for that customer with exchange-account, but it don't change this behavior.
changing plesk MX-records to microsoft doesn't change anything either.

how to solve this issue?

thx
Marc

 

[mow]

This is not solvable with dns alone: If you let plesk handle a domain normally, then domain.tld will be recognized as local by the mailserver.
One workaround would be to not let plesk handle domain.tld as a whole, but only add subdomains like www.domain.tld etc. Then domain.tld will not be local and mail delivery will follow the MX.

 

[Bitpalast]

In order to have mails delivered via your external MX server, the recipient's account on your local server must have email service deactivated. Else your mail server thinks that he is authoritative for the domain itself.

 

[g4marc]

thx for answers.

I'm wondering that it doesn't work via DNS management? Actually, you can edit the entries accordingly and enter the external mail server there. then what is it good for?

I haven't tried deactivating the email function for this account yet, but I'm afraid that I'll get the message from the mail server, it's an unknown address.
Has anyone tried that yet?

Unfortunately, I can't test it immediately because of that issue there is a lot of emails in their mailbox that they haven't read yet.