Mail Delivery System <[email protected]> emails
I periodically get emails structured in the following manner. I have changed the first part of the email address and the IP address for anonymity purposes: This message was created automatically by mail delivery software. A message that you sent has not yet been delivered to one or more of its recipients after more than 24 hours on the queue on biz190.inmotionhosting.com. The message identifier is: 1bKRrp-002dEE-1v The subject of the message is: RE: AJA Mailing Address The date of the message is: Tue, 5 Jul 2016 08:02:26 -0700 The address to which the message has not yet been delivered is: [email protected] host mailin-02.mx.aol.com [xxx.xxx.x.xx] Delay reason: SMTP error from remote mail server after end of data: 421 4.2.1 : (DYN:T1) https://postmaster.aol.com/error-codes#421dynt1 No action is required on your part. Delivery attempts will continue for some time, and this warning may be repeated at intervals if the message remains undelivered. Eventually the mail delivery software will give up, and when that happens, the message will be returned to you. Ultimately I receive an email that the email was not sent & informing me of such. When I actually make contact with the person, either using another one of their email addresses or another one of mine, they indicate they do receive my email. There is no consistency with this problem. It's just very annoying. Is this a legitimate email from biz190.inmotionhosting.com or Mail Delivery System which is the actual sender of the email?