Check Credentials: Verify that the email address and password are entered exactly as they appear in the admin console. A common error is the "535 5.
Implementing TLS Encryption for Microsoft 365 SMTP Server
You cannot simply connect to the server and send mail; you must prove your identity. Alternatively, port 25 is often used for server-to-server relay between mail servers, although many cloud providers restrict its use for third-party applications to combat spam.
These failures usually stem from configuration mismatches or security policies blocking the traffic. The process involves defining the outgoing mail server hostname and selecting the appropriate port numbers to establish a secure connection.
Implementing TLS Encryption for Microsoft 365 SMTP Server
com Port (Recommended) 587 Encryption STARTTLS Authentication Required The Role of Authentication Security is paramount when using cloud-based infrastructure, and the Microsoft 365 SMTP server enforces strict authentication to prevent unauthorized use. Setting up a reliable method for applications and devices to send email is a foundational task for any organization using Microsoft 365.
More About Microsoft 365 smtp server
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