So you can send SMTP emails from the terminal?
And you can send SMTP from another application?
Is the application that CAN send SMTP email a System utility or a third party application?
SMTP emails from the server terminal - yes
SMTP (notification) emails from FileMaker Server on the server machine - yes
SMTP emails from FileMaker Pro database hosted by FileMaker Server on the server machine - no
I don't know what to try.
Port 25 is the default SMTP port without authorization may be blocked.
This is to prevent the server from being used for spam.
The authorized port that requires user and password is port 587?
This is a shot in the dark.