It is vital to ensure that your settings are configured to require this encryption, as sending credentials over an unencrypted link poses a severe security risk. 1 Client was not authenticated" error, which occurs when the server requires encryption, but the client is attempting to send data in plain text.
Troubleshoot Microsoft 365 SMTP Errors and Solutions
The process involves defining the outgoing mail server hostname and selecting the appropriate port numbers to establish a secure connection. Review Firewall Rules: Ensure that outbound traffic on port 587 is not being blocked by network security groups or local firewalls.
Setting Value SMTP Server smtp. Even with correct settings, email delivery can sometimes fail, leading to frustration for end-users.
Troubleshoot Microsoft 365 SMTP Errors and Authentication Fixes
Once the encryption is established, the credentials are transmitted securely, protecting them from interception. You cannot simply connect to the server and send mail; you must prove your identity.
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