Email server issue: not receiving emails

Job ID: 38318305

Budget: €8 – €30 EUR

I'm in need of an experienced mail server specialist to urgently address issues preventing the receiving of emails on my server. The fix needs to be done within 2 days.

OS: Ubuntu 20.04 (64 Bit)
My domain is registered at Vimexx. My VPS is at contabo.com. I use Cloudflare.

Something is not correctly configured now. I can send email, but receiving mails does not work. Your task is to fix the issue resulting in a good working mail server which can send/receive email in a secure way. Afterwards guide me to reveive a copy of the emails on my local machine (using Thunderbird). The email should also stay on the mail server.

If you are an experienced mail server specialist, I think you will have noticed within an hour which settings are not correct.

Important: don't take hours to respond on the chat! If this happens, I lose confidence in a good result.
Related categories: System Admin Linux DNS VPS Ubuntu