Inspect Application Permissions: Some applications or APIs require specific app passwords or registered permissions to access the SMTP relay. The server responsible for this critical function is the Microsoft 365 SMTP server, which acts as the digital post office for outbound mail.
Test Microsoft 365 SMTP Connectivity and Verify Server Settings
A common error is the "535 5. Port 587 is the industry-standard choice for message submission and is recommended for most use cases, as it explicitly signals that the client intends to send mail.
This is typically achieved using the same credentials that employees use to log into their Outlook web interface or corporate email client. 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.
Test Microsoft 365 SMTP Connectivity and Verify Server Settings
For the connection to be secure, you must configure your software to use one of the standard encrypted ports. Another frequent issue is the "550 5.
More About Microsoft 365 smtp server
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