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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://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 are already described in …
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://www.axigen.com/forum/forum/support-discussion-lists/general-configuration/23763-550-delivery-not-allowed-error-when-sending-emails-to-external-domain
For example I could not understand what means 'our external domain'? If you are sending an email from Axigen to an external server and this last one reject it with '550 - delivery not allowed' than you have to find why that particular external server is not able to deliver …
https://stackoverflow.com/questions/15831408/javamail-hmailserver-550-delivery-is-not-allowed-to-this-address
Javamail /hMailServer 550 Delivery is not allowed to this address. I am trying to send emails with javamail and a local smtp serveur (hMailServer).
https://social.technet.microsoft.com/Forums/en-US/a36fd932-eccb-44b6-9550-cbbfc5d49563/550-571-you-are-not-allowed-to-send-external-email-from-mailbox
May 19, 2019 · Your message wasn't delivered due to a permission or security issue. It may have been rejected by a moderator, the address may only accept e-mail from certain senders, or another restriction may be preventing delivery. #550 5.7.1 You are not allowed to send external Email ##<o:p></o:p>
https://support.smtp2go.com/hc/en-gb/articles/360015283053-Error-550-that-SMTP-username-s-account-is-not-allowed-to-send
Email Delivery; 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://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. Please inspect your SPF settings, and try again.
https://answers.microsoft.com/en-us/msoffice/forum/all/550-50350-remote-server-returned-an-error-550/801d4010-d8c2-43d4-bd20-8ff2c18262a7
Oct 02, 2017 · I checked the non-delivery report (NDR). The SCL value is set to 1 which means Exchange Online Protection (EOP) marks the email as safe and didn't block it either. Meanwhile, I find you have created two SPF records for your domain. It is not the recommended to maintain multiple SPF records for a domain in Office 365.
https://stackoverflow.com/questions/12495509/mail-smtp-server-response-550-the-address-is-not-valid-error-on-hmailserver
As an example, the default IP range configuration does not allow external users to send messages to other external users. This is to prevent people from using your server to send spam. So if an external …
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