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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
If the recipient is an internal group: You might not have permission to send to the group or to one of its subgroups. In this case, the NDR will include the names of the restricted groups that you don't have permission to send to.
http://myitengineer.com/hmailserver-smtp-protocol-error-550-delivery-is-not-allowed-to-this-address/
May 05, 2016 · SMTP protocol error: 550 Delivery is not allowed to this address. Cause. Sending emails to the HMailServer from a different host is prevented by default as this could result in spamming. Solution. Go to settings => advanced => IP Ranges =>Internet. In the Allow deliveries from section check both. external to local.
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/fix-error-code-550-5-1-1-through-5-1-20-in-exchange-online
Compare the recipient's email address in the NDR with the recipient's email address in the message in your Sent Items folder. If the addresses don't match, contact the recipient (by phone, in person, etc.) and ask them if they've configured an email rule that forwards incoming email …
https://www.hmailserver.com/forum/viewtopic.php?t=3027
Jul 22, 2008 · 550 Delivery is not allowed to this address. Use this forum if you have installed hMailServer and want to ask a question related to a production release of hMailServer. Before posting, please read the troubleshooting guide. A large part of all reported issues …
https://serverfault.com/questions/837329/smtp-error-550-delivery-not-allowed-to
The created email address is working fine. I mean I can login to the mail server and check the inbox of this user (the moodle). Also, there is a plugin for testing the setting. The log shows that delivery is not allowed and I don't know which side is causing such a problem, either the mail server admin or some setting errors.
https://bobcares.com/blog/550-email-blocked/
Sep 29, 2018 · Almost all mail servers refuse to admit mails marked as spam, and it shows the error “550 Email blocked“. The most common reason for this error is IP blacklisting , where the sender’s server IP is listed as a spam source in SpamHaus, Senderbase, or other such email reputation tracking services.
https://www.crazydomains.com.au/help/550-blocked-error-explained/
If you have checked the email address and you are certain you typed it correctly, but you still get an SMTP 550 Error, then perhaps you got the wrong email address from the recipient. It could also be that they have changed the domain name or any other part of the address.
https://answers.microsoft.com/en-us/msoffice/forum/all/550-57367-remote-server-returned-not-permitted-to/f9c44a83-2860-4b3c-b46e-cf5dcd4284a5
Jun 02, 2019 · Reported error: 550 5.7.367 Remote server returned not permitted to relay -> 553 sorry, relaying denied from your location [40.**.**.**] ... please contact the recipient to add the affected user's IP address to the recipient's safe sender list and check the result. Meanwhile, please kindly refer to following article to check this issue on your ...
https://bobcares.com/blog/550-is-not-allowed-to-send-mail-from/
Error "550 is not allowed to send mail from" is caused when the sender's IP is not present in SPF records. Here are 3 cases it can happen how to fix them.
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