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https://www.ideaminetech.com/blog/solve-550-unrouteable-address-error/
The reasons for the 550 email errors range from a non-existing email account to a wrongly added email server rule. To rectify the error, first, we have to analyze the basic process behind every email communication. While sending an email, it is routed from the server email to the receiver email server. Later the recipient downloads the email from his email server.
https://bobcares.com/blog/how-to-fix-550-unrouteable-address/
A typo in the email address can cause mail delivery attempt to an invalid domain. Also, the recipient domain which was once existing, but got deleted or deactivated …
https://answers.microsoft.com/en-us/outlook_com/forum/oemail-osend/problems-receiving-mail-unrouteable-address/801da010-3651-4563-87e6-2a1688d00b17
Mar 19, 2020 · In the Blocked senders list, select the name or domain (the part of an e-mail address that follows the @ sign, such as outlook.com) that you want to receive emails from. Click Remove from list. Once you are done, you need to add the email address to your safe senders list. Under “Preventing junk email”, click Safe and blocked senders.
https://techjourney.net/email-bounces-back-with-unrouteable-mail-domain-error/
Another possible cause for “unrouteable mail domain” problem when sending mail generated by PHP scripts is the security feature of the web host and Apache HTTPD PHP module.
https://docs.microsoft.com/en-us/exchange/mail-flow-best-practices/non-delivery-reports-in-exchange-online/fix-error-code-550-5-1-0-in-exchange-online
Your email address could be in the recipient's personally-maintained block list. This is the likely cause if you can successfully send messages to other recipients in the same domain (for example, @fabrikam.com). Contact the recipient (by phone, in person, etc.) to …
https://serverfault.com/questions/341507/smtp-unroutable-address
This doesn't work. Presumably exim is seeing the address as local and fails to forward it to the google servers. The delivery fails with: Subject: Mail delivery failed: returning message to sender This message was created automatically by mail delivery software. A message that you sent could not be delivered to one or more of its recipients.
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
Their rule could have tried to send a copy of your message to a bad email address. If the recipient has such a rule, they'll need to correct the destination email address or remove the rule in order to prevent 5.1.x message delivery errors. Solution 4: Verify that your account hasn't been compromised. Did you send the original message at all?
https://forum.directadmin.com/threads/unrouteable-address.11658/
Nov 09, 2006 · Just some updates on the problem. Email sent to the first user is POSSIBLE only when using Webmail. User recieved email. But if email is sent from Outlook, unrouteable address occurred.
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