MX record is not seen on the Internet

Hi,
I have 7 domains registered with cloudflare. They have identical MX records.
MX records of 3 domains work (are seen on the Internet), 4 others - don’t.
An example of the domain in trouble: (http://pulsemails.net)

I appreciate any advise.

Truly a mystery:

4 Likes

Thank you very much for your hint. We forgot to check the easiest reason possible.

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