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https://www.inmotionhosting.com/support/email/email-error-554/
Oct 30, 2012 · hello, i got bounce back email like this one : The following message to <[email protected]> was undeliverable. The reason for the problem: 5.3.0 – Other mail system problem 554-‘Message rejected for policy reasons.’Author: Jacob Nicholson
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/fix-error-code-5-4-6-through-5-4-20-in-exchange-online
554 5.4.6 Hop count exceeded - possible mail loop (always generated by on-premises Exchange Servers) 5.4.14 Hop count exceeded - possible mail loop ATTR34 (always generated by Exchange Online) Still need help? See also. Email non-delivery reports in Exchange Online. Related Articles
https://community.cisco.com/t5/email-security/reason-5-3-0-other-mail-system-problem-542/td-p/2423265
Mail system status X.3.0 Other or undefined mail system status The destination system exists and normally accepts mail, but something about the system has caused the generation of this DSN. The '542' = Bad Connection. 5.7.1 always means there is a permanent failure of …
https://helgeklein.com/blog/2013/11/workaround-554-rejected-due-spam-content-sending-e-mail/
Nov 14, 2013 · Just in case it helps anyone else I seem to have a similar issue with emails to people using the provider xtra.co.nz – I receive the message “The reason for the problem:5.3.0 – Other mail system problem 554-‘5.7.1 Message rejected due to possible spam content’ ”
https://community.spiceworks.com/topic/1150474-remote-server-returned-554-rejecting-banned-content
Sep 04, 2015 · Remote Server Returned '554 rejecting banned content. This is telling you, its them not you. If you have the full email headers you will see IP addresses, if there are some that do not belong to your company, that also confirms they are externally dropped.
https://answers.yahoo.com/question/index?qid=20131004113606AA8QD5a
Oct 04, 2013 · 5.3.0 - Other mail system problem 554-"delivery error: dd This user doesn't have a yahoo.ca account? I have received this message only once or twice in the last couple of years, and in both cases, the message rejected was sent using "reply to" via SMTP through my ISP.
A mail forwarding loop can occur when you set up mail forwarding on two accounts so that the first account forwards all its mail to the second, and the second account forwards mail back to the first. If your mail delivery system had no limit on hops, your message could be bounced back and forth between these two accounts indefinitely.
https://success.trendmicro.com/solution/1057285
For further assistance, please send mail to postmaster.If you do so, please include this problem report. You can delete your own text from the attached returned message. The mail system <[email protected]>: host j.mx.mail.yahoo.com[66.94.237.64] said: 554 Message not allowed - [320] (in reply to end of DATA command)
https://cyberpersons.com/2020/01/25/how-to-fix-550-permanent-failure-for-one-or-more-recipients/
Jan 25, 2020 · Recipient mail servers typically allow all the genuine emails, but due to various reasons an email can be flagged as spam and you might receive 550 permanent failure for one or more recipients as an error, thus email being rejected by the recipient mail server.
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