Maildelivery error message for a specific when contact of the envoys of Macbook, NOT sending the iPhone.

Hello! When sending mail to a specific contact from my application of Mail of Macbook, I started getting error messages Maildelivery a few weeks ago and discovered at the same time that the mail goes by without problem when sending from iPhone.  My Macbook Pro running OSX El Capitan 10.11.5.

The error message I get is:

This message was created automatically by mail delivery software.

A message you sent could not be delivered to one or more of its

beneficiaries. This is a permanent error. The following address(es) failed:

Name@domain

retry timeout exceeded

Reporting-MTA: dns; vie01a-pqmta - at02.mx.upcmail .net

Action: failure

Final beneficiary: rfc822;name@domain

Status: 5.0.0

The error only occurs when the message is sent from Mail on Macbook, NOT sending the iPhone. And only this one contact me. Any ideas? Help would be appreciated since I need to send important emails very frequently. One more thing: this occurs when sending mac.com account as well as the gmail.com account, but both mail on Macbook.

This information should help you get help using iCloud Mail - Apple Support

If you cannot send or receive e-mail on your Mac - Apple Support

Tags: Notebooks

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