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https://www.hmailserver.com/forum/viewtopic.php?t=3027
Jul 22, 2008 · The tutorial is found under the documentation page Installation->Quick start guide->Configuration tutorial..I guess you didn't look very long. What do you mean with "It is the SMTP conversion method"? The syntax for the MAIL FROM command is MAIL FROM:<reverse-path>.There should not be a space there.
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://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://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://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://bobcares.com/blog/550-email-blocked/
Sep 29, 2018 · 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) It means that the recipient’s mail server smtp.recipient.com rejected the mail from mx.sender.com because the spam filter at junkemailfilter.com classified the mail as spam.
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 address is not allowed to send. This email rejection is generated if you have not yet verified your sending domain, or if you've added a domain name that was only recently registered.
https://answers.microsoft.com/en-us/outlook_com/forum/oemail-osend/smtp-relay-550-error-help/38e31ea0-c2d5-411f-b55f-8333cfe8366b
Feb 10, 2016 · 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://serversmtp.com/smtp-error/
A syntax error: the server couldn’t recognize the command. It may be caused by a bad interaction of the server with your firewall or antivirus. Read carefully their instructions to solve it. 501. Another syntax error, not in the command but in its parameters or arguments.
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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