Reported error: 550 5.4.355 Remote server returned recipient domain does not exist -> 553 #5.1.8 Domain of sender address <xx@xxxx.org> does not exist

Getting a lot of undeliverable email notifications -

Reported error: 550 5.4.355 Remote server returned recipient domain does not exist -> 553 #5.1.8 Domain of sender address <xx@xxxx.org> does not exist
Kenneth HaasAsked:
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hecgomrecCommented:
Make sure the domain name used to send the emails exist within your organization and the exchange server is authorized to use it.,
David FavorLinux/LXD/WordPress/Hosting SavantCommented:
Sometimes this occurs when an email relay incorrectly rewrites the sender from someone@foo.com to someone@relay1.foo.com incorrectly, so the bare domain foo.com gets incorrectly rewritten as the relaying host (relay1.foo.com), so the recipient domain fails for all email.

Take a look closely at entire envelop headers, rather than just believing the STMP response is correct.
WiReDWolfCommented:
Is this an Exchange server or something else?

This is usually a DNS error where there's no A record for the mail server.
AkhaterSolutions ArchitectCommented:
  1. I take it that xxxx.org is your domain right?
  1. Do you have an MX record for xxx.org?
  1. Do you have PTR record for the IP you are sending your emails from?
  1. Does this PTR record has a matching A record?
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