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http://myitengineer.com/hmailserver-smtp-protocol-error-550-delivery-is-not-allowed-to-this-address/
May 05, 2016 · You attempt to send emails via HMailServer and receive the following error: 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
https://www.hmailserver.com/forum/viewtopic.php?t=3027
Jul 22, 2008 · Re: 550 Delivery is not allowed to this address Post by gotzboost » 2008-07-22 21:36 brucestr21 wrote: it doesn't look like you have any domains in hmailserver (or possibly an incorrect domain), hence why checking 'external to external' works.
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
Add the sender to the group's allowed senders list. Note that you must create a mail contact or a mail user to represent the external sender in your organization. If the sender is restricted because they're external (outside your organization), configure the group to accept messages from external senders.
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 …
https://stackoverflow.com/questions/12495509/mail-smtp-server-response-550-the-address-is-not-valid-error-on-hmailserver
I have sent emails via non-php methods with [email protected] so presumably that's not a problem – user1557515 Sep 19 '12 at 13:26
https://www.axigen.com/forum/forum/support-discussion-lists/webmail/2199-550-delivery-not-allowed
550 delivery not allowed February 1st, 2010, 09:27 AM. hi is there someone who can help me. we can not recieved some emails from our friends and clients, from their yahoo mail and work mail. this is the message: Sorry ...
https://bobcares.com/blog/550-is-not-allowed-to-send-mail-from/
Remote host said: 550 5.1.0 xx.xx.xx.xx is not allowed to send from <domain1.com> per it's SPF Record. Please inspect your SPF settings, and try again. This means that the mail failed an anti-spam check called SPF, and it was rejected by the recipient’s server.
https://bobcares.com/blog/550-email-blocked/
Sep 29, 2018 · I'm sorry to have to inform you that your message could not be delivered to one or more recipients. It's attached below. The mail system : host smtp.recipient.coml[XXX.211.XXX.31] said: 550 Email blocked by hostkarma.junkemailfilter.com (in reply to RCPT TO command)
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 · Tech support scams are an industry-wide issue where scammers trick you into paying for unnecessary technical support services. You can help protect yourself from scammers by verifying that the contact is a Microsoft Agent or Microsoft Employee and that the phone number is an official Microsoft global customer service number.
https://portal.smartertools.com/community/a86442/MasterPages/MasterPages/
Interestingly, I found that this issue was narrowed to a single user account. Other user accounts would send just fine. But if this particular user account tried to send anything, they received the undeliverable "550 Outgoing SMTP is not allowed".
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