This is done using a protocol known as STARTTLS, which is initiated after the initial connection is made. The mechanism, usually labeled "Authentication," requires a username and password to validate the sender before allowing the transaction to proceed.
Microsoft 365 SMTP Relay Setup and Configuration Guide
3 Authentication unsuccessful" message, which indicates that the username or password provided is incorrect. Inspect Application Permissions: Some applications or APIs require specific app passwords or registered permissions to access the SMTP relay.
The process involves defining the outgoing mail server hostname and selecting the appropriate port numbers to establish a secure connection. 1 Client was not authenticated" error, which occurs when the server requires encryption, but the client is attempting to send data in plain text.
Microsoft 365 SMTP Relay Setup and Configuration
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. Modern Security Protocols To maintain the integrity of the communication, the connection should be upgraded from plain text to an encrypted channel.
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