Forum Discussion
Email issues after adding new domain
- Best run some message traces, they should give you a clue as to what's happening: https://docs.microsoft.com/en-us/exchange/monitoring/trace-an-email-message/message-trace-modern-eac
Also, make sure that you have configured SPF for your domain as a minimum, and preferably DKIM/DMARC as well. https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/set-up-spf-in-office-365-to-help-prevent-spoofing?view=o365-worldwide
Also, make sure that you have configured SPF for your domain as a minimum, and preferably DKIM/DMARC as well. https://docs.microsoft.com/en-us/microsoft-365/security/office-365-security/set-up-spf-in-office-365-to-help-prevent-spoofing?view=o365-worldwide
VasilMichev These are the most common NDRs that I found...
550 5.4.316 Message expired, connection refused, Socket error code 10061‎
‎554 5.7.1 [CS01] Message rejected due to local policy. Please visit https://support.apple.com/en-us/HT204137‎
550 5.1.0 550 #5.1.0 Address rejected‎
I have looked each one of these up and they all appear to be a recipient side issue, whereas the recipient's "IT" needs to add our email address(es) or domain to their allow/white list. These issues were not happening with the initial domain that was setup. I added the new domain directly through the M 365 Admin Center and all required DNS Records were created automatically and are showing as Healthy or OK. The only good thing here is that it's not happening for every client, only just a select few at this time.
Any additional ideas/thoughts on this matter?
Thank you in advance.
