Question How to deal with sending emails to the same domain when email is hosted elsewhere

[MHC_1]

Server operating system version

alma Linux 9.7

Plesk version and microupdate number

Obsidian 18.0.76#2

WE have a website only that is on Plesk Obsidian 18.0.76#2

Plesk deals with the DNS and with the website. But the email aspects are delegated to Google.


The email accounts are controlled and hosted by Google.

We have moved this domain incoming from WHM where it worked perfectly with Exim.

The issue is that sending email from the website fails to deliver the email off server. How do we correct this?

We have tried:

-- Sending email from another email account on the server. Result below:
-- Setting both domains under the same subscription
-- Setting up the sending mailbox on the server ( IssueDomain.org.uk ).
-- Setting up the domain IssueDomain.org.uk both not to have emails enabled at all

The receiving email mailbox does not exist on the local server.

Issue domain: IssueDomain.org.uk
Secondary Domain: secondDom.org.uk
Server Host: server-host.com

Email response is always as follows:

This is the mail system at host server-host.com.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

<[email protected]>: This address no longer
accepts mail.
Reporting-MTA: dns; server-host.com
X-Postfix-Queue-ID: DF01952000C16
X-Postfix-Sender: rfc822; [email protected]
Arrival-Date: Sat, 28 Feb 2026 21:59:21 +0000 (UTC)

Final-Recipient: rfc822; [email protected]
Original-Recipient: rfc822;[email protected]
Action: failed
Status: 5.2.1
Diagnostic-Code: x-unix; This address no longer accepts mail.

Account DNS for : IssueDomain.org.uk

IssueDomain.org.uk	TXT	v=spf1 +a +mx +ip4:12.34.56.78 +ip6:2a00:etc:etc:etc:a300::1 include:_spf.google.com ~all
IssueDomain.org.uk		MX (0)	aspmx.l.google.com.
IssueDomain.org.uk		MX (5)	alt1.aspmx.l.google.com.
IssueDomain.org.uk		MX (5)	alt2.aspmx.l.google.com.
IssueDomain.org.uk		MX (10)	alt3.aspmx.l.google.com.
IssueDomain.org.uk		MX (10)	alt4.aspmx.l.google.com.

Email on the sever delivers perfectly to third party that are not @IssueDomain.org.uk but fail to deliver to IssueDomain.org.uk .

How do we resolve?

 

[Kaspar]

On the domain settings of the domain, select the "Disabled for incoming mail" option as the setting for "Mail service on this domain".

See documentation here

 

[MHC_1]

Hello, @Kaspar . We had set the email to be turned off entirely for the domain. Will try with this suggestion and will feed back. Thank you.