After migration from Contabo to OVHCloud VPS receiving email fails

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After 48 hours, I transferred the domain name, and everything seems to be working now.

However, a few steps have been taken:

  1. IPv4 only
  2. No second DNS/ DNS reverse
  3. Delete cloudinit DNS IPs from /etc/resolvconf/resolv.conf.d/head and
  4. Domain name register transfer.

I hope that this will be a long-term solution and that I will not need to come back and ask for help here. Thanks to all for their great support.

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