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They receive an error message when the email is returned to them. Is this on their end?

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Smokva beantwoord
tonyashmore
tonyashmore

Delivery to the following recipient failed permanently: 

    tonyashmore@mail.com

Technical details of permanent failure: Google tried to deliver your message, but it was rejected by the server for the recipient domain mail.com by mx01.gmx.com. [74.208.5.27].

The error that the other server returned was: 550-Requested action not taken: mailbox unavailable 550 invalid DNS MX or A/AAAA resource record

Delivery to the following recipient failed permanently: tonyashmore@mail.com Technical details of permanent failure: Google tried to deliver your message, but it was rejected by the server for the recipient domain mail.com by mx01.gmx.com. [74.208.5.27]. The error that the other server returned was: 550-Requested action not taken: mailbox unavailable 550 invalid DNS MX or A/AAAA resource record

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Smokva
Smokva

I'm not certain who is 'they'. I assume you are referring to the person who attempted to send the email. Seems like a standard non-deliverable mail to me which usually points to an incorrect address. Should it be @gmail? In any case, it is obvious that the mail.com server rejected the email. If the address is correct, the issue needs to be taken up with them.