Technical Configuration for Microsoft 365 SMTP To utilize the Microsoft 365 SMTP server, specific technical parameters must be configured within your application or device settings. Modern Security Protocols To maintain the integrity of the communication, the connection should be upgraded from plain text to an encrypted channel.
Secure SMTP Connections Microsoft 365: Implementing STARTTLS and Port 587
Once the encryption is established, the credentials are transmitted securely, protecting them from interception. This is done using a protocol known as STARTTLS, which is initiated after the initial connection is made.
Verify Port Settings: Ensure that the port is set to 587 and that the connection type is set to TLS or STARTTLS. For the connection to be secure, you must configure your software to use one of the standard encrypted ports.
Implementing Secure SMTP Connections with STARTTLS and Authentication
1 Client was not authenticated" error, which occurs when the server requires encryption, but the client is attempting to send data in plain text. This is typically achieved using the same credentials that employees use to log into their Outlook web interface or corporate email client.
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