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https://www.iplocation.net/email-delivery-problems
Common Mail Delivery Problems. Some of the common email delivery problems are listed below. User Unknown: The username portion of the email address (username@host) is no good. The user account may have been expired or deleted. Host Unknown: The hostname portion of the email address (username@host) is no good. The DNS may not be able to resolve host's IP address.
https://community.mcafee.com/t5/Ironmail/MEG-7-6-Quarantine-digest-442-unable-to-determine-IP-address-of/td-p/454442
MEG 7.6 - Quarantine digest - 442 unable to determine IP address of delivery. First of all let me get one thing out of the way: I'm a self tought noob on MEG. We are currently using 6.8 (physical) and I was tasked to upgrade to 7.6 (virtual).
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/fix-error-code-550-5-7-1-in-exchange-online
Delivery: If Route mail through smart hosts is selected, confirm the correct IP address or FQDN is specified. If MX record associated with the recipient domain is selected, confirm the MX record for the domain points to the correct mail server.
https://www.usps.org/info/smtp_status.html
The mailbox is a mailing list address and the mailing list was unable to be expanded. This code may represent a permanent failure or a persistent transient failure. X.3.0 Other or undefined mail system status - Code: 421, 451, 550, 554
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