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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.
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://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 know it is valid because it works when I send it from squirrel mail but when sending mail in php it will just not work. the invalid address presumably refers to the send_from address. so I can't see how it can think it's wrong. here is the php code:
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.
https://serversmtp.com/smtp-error/
46 rows · Meaning, if both your address and the recipient’s are not locally hosted by the server, a relay …
https://support.smtp2go.com/hc/en-gb/articles/360015283053-Error-550-that-SMTP-username-s-account-is-not-allowed-to-send
Error: 550 that SMTP username's account is not allowed to send. Also applies to: Error: 550 that IP …
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".
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
Delivery: If Route mail through smart hosts is selected, confirm the correct IP address or FQDN is specified. If MX record associated with the recipient domain is selected, confirm the MX record for the domain points to the correct mail server.
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.
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