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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
Their email admin might need to reconfigure the recipient's mailbox so it accepts email from you. If the recipient is an internal group: You might not have permission to send to the group or to one of its subgroups. In this case, the NDR will include the names of the restricted groups that you don't have permission to send to.
https://www.mailenable.com/forum/viewtopic.php?t=23495
Mar 26, 2019 · The server rejected one or more recipient addresses. The server response was: 503 This mail server requires authentication when attempting to send to a non-local e-mail address. Please check your mail client settings or contact your administrator to verify that the domain or address is defined for this server. Doe this help diagnosis?
http://netkiller.sourceforge.net/mail/faq/smtp.error.html
Q:The server says:553 sorry,you are not allow to use this SMTP to relay your eami Q:The server says:553 sorry, that domain isn't in my list of allowed rcpthosts A:使用21cn.com，china.com，371.net，sina.com等大多數信箱的smtp伺服器時，只能用自身的信箱發信，所以要在Outlook Express的“帳戶屬性”中的“個人 ...
https://www.experts-exchange.com/questions/20526662/Help-problems-with-seding-to-this-recipient.html
(The Following recipient was not reached) '[email protected]' den 24.02.2003 10:15 Det oppstod et SMTP-kommunikasjonsproblem med mottakerens e-postserver. Kontakt systemansvarlig. (the problem was a smtp communications problem with the recipents epost server) <hq-srvex01-w2s.lindhard.c om #5.5.0 smtp;551 delivery not allowed to non-local recipient>
https://bobcares.com/blog/how-to-fix-550-511-recipient-address-rejected-error/
Sep 22, 2016 · If the MX record for the recipient domain is resolving wrongly to some other remote server, then the email will not be routed to the correct mail server. As a result, the mail server that received the mail will not be able to track the email account in it and hence mail delivery will fail. To confirm the MX records for a domain, use the command:
https://support.forcepoint.com/KBArticle?id=Why-is-email-not-being-delivered
Oct 25, 2016 · non-delivered (a non-delivery notification should have been sent back to the sender); queued and delivery will be retried later. Occasionally - for example if different policies apply to the various recipient domains of a message - the service splits the message into several separate messages, each of which is processed separately.
https://answers.microsoft.com/en-us/outlook_com/forum/oemail-osend/when-office-365-tried-to-send-your-message-the/e377d241-6ff6-4cee-a0f5-4dd7205d5fb1
May 12, 2016 · For security or policy violation issues, it might be sufficient for them to just add your sending IP addresses or domain to their allowed senders list. It's likely that only the recipient's email admin can fix the problem. Unfortunately, it's unlikely Office 365 Support will be able to help with these kinds of externally reported errors.
https://support.3dcart.com/Knowledgebase/Article/View/2/1/can-not-send-email-using-outlook-error-550-not-local-host-not-a-gateway
If you do not want to use your ISPs server for SMTP, and the ISP is blocking port 25, you can switch the port to 587 for your outgoing mail and use mail.yourdomain.com for the SMTP server name. This article is specific to users of 3dcart Shopping Cart Software.
https://serversmtp.com/smtp-error/
“User not local will forward”: the recipient’s account is not on the present server, so it will be relayed to another. It’s a normal transfer action. For other information check out our article on what is an SMTP server. 252. The server cannot verify the user, but it will try to deliver the message anyway.
https://answers.microsoft.com/en-us/msoffice/forum/msoffice_outlook-mso_other-msoversion_other/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.
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