Review Firewall Rules: Ensure that outbound traffic on port 587 is not being blocked by network security groups or local firewalls. You cannot simply connect to the server and send mail; you must prove your identity.
Microsoft 365 SMTP Troubleshooting: Fixing Connection and Authentication Issues
The process involves defining the outgoing mail server hostname and selecting the appropriate port numbers to establish a secure connection. The server responsible for this critical function is the Microsoft 365 SMTP server, which acts as the digital post office for outbound mail.
Unlike standard email clients that use a graphical interface to manage accounts, SMTP requires manual input of server addresses and security protocols. Once the encryption is established, the credentials are transmitted securely, protecting them from interception.
Troubleshooting SMTP Connection and Authentication Issues
Another frequent issue is the "550 5. Setting Value SMTP Server smtp.
More About Microsoft 365 smtp server
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