@mac.com address defect

[radstar]

Hey,

since approx. two weeks my @mac.com-adress isn't working properly. This means I can only receive mails on irregular basis. The sender gets an automatic "Undelivered Mail Returned to Sender" as answer. I've attached an example below from a test a did two hours ago.

Has anyone experienced similar issues?

I already talked to the 1st and 2nd apple support for one hour but they couldn't help me. Unfortunately the support engineers are on holiday until mid of January.

The @icloud.com address, which is using the same iCloud account, works without any problems. I just don't want to loose the @mac.com address

Best
radstar

This is the mail system at host mr28p00im-smtpin029.me.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

<XYZ@mac.com>: mail for mac.com loops back to myself
Reporting-MTA: dns; mr28p00im-smtpin029.me.com
X-Postfix-Queue-ID: 3E4ECAC0095
X-Postfix-Sender: rfc822; XYZ@mac.com
Arrival-Date: Thu, 27 Dec 2018 12:31:22 +0000 (UTC)

Final-Recipient: rfc822; XYZ@mac.com
Original-Recipient: rfc822;XYZ@mac.com
Action: failed
Status: 5.4.6
Diagnostic-Code: X-Postfix; mail for mac.com loops back to myself

Von: radstar <XYZ@mac.com>
Betreff: Test
Datum: 27. Dezember 2018 um 13:31:16 MEZ
An: radstar <XYZ@mac.com>


Test