Mail not working anymore here, too

Hello guys,
after switching to Cloudflare we cannot send/receive mails anymore.
I have already checked the turorial of domjh:
and everything looks fine for me.
Here are my Cloudflare settings:

So, anybody has an idea, what’s going wrong?

Thanks in advance

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Emails should reach your server just fine. The question is if you can access them from your client.

What exactly does that mean?

Post screenshots of whatever error you get.

Reporting-MTA: dns;
X-Postfix-Queue-ID: 544E61235E7
X-Postfix-Sender: rfc822; [email protected]
Arrival-Date: Fri,  3 May 2019 11:40:50 +0200 (CEST)

Final-Recipient: rfc822; [email protected]
Original-Recipient: rfc822;[email protected]
Action: failed
Status: 5.1.1
Remote-MTA: dns; mailmx02.internal
Diagnostic-Code: smtp; 550 5.1.1 <[email protected]>: Recipient
    address rejected: User unknown in virtual alias table

That is not an error related to Cloudflare. Your mail server simply rejects that email as it does not recognise the user.

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