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SMTP Authorization failed: Is Microsoft Blocking my site IP?
I have several sites whose MFPs fail to authenticate to http://smtp.office365.com/. MFP is current, settings are triple-checked, firewalls are opened to Office365, TLS, and email authentication confi...
- This issue has been resolved. All affected sites were not included within the Trusted sites designation so the SMTP Auth failed. Some of the affected sites had dynamic public IPs which excluded them from the list, others had not been updated and thus had outdated public IP information.
This issue has been resolved. All affected sites were not included within the Trusted sites designation so the SMTP Auth failed. Some of the affected sites had dynamic public IPs which excluded them from the list, others had not been updated and thus had outdated public IP information.