Symptom:

Email notifications are not received.
You see something like the following error messages when setting up email in System > Settings:
"Could not sent e-mail notifications, please check settings: Could not connect to SNTP host: 10.0.0.6 port 25, nested exception is java.net.ConnectException: Connection timed out."

"Can not send email notifications, please check settings: Invalid Addresses; nested exception is: javax.mail.SendFailedException: 550 rejecting spoofed message"
"Could not connect to SMTP host: relay.ufa-slco.org, port: 25"
There are many different error messages, and usually those error messages will help to shed light on what the source of the issue is.
Prerequisites:
You are using one of your email servers rather than the "localhost" option, which sends notification emails from the CFA itself.
Resolution:
Often, these errors are related to settings on the Email Server in use. Rather than using a separate e-mail server, try using localhost in the 'Email Server" field, leaving the username and password fields below blank.
By default, the CFA will use the localhost to send the e-mail message directly from the CFA.
To troubleshoot and diagnose the errors while still using your own Email Server, try the following:
  • Go to Support > Diagnostics > ping the IP address of the e-mail server you are using
    • If pinging fails, try to traceroute to the same IP to determine where the disconnect occurs
  • Check and/or reset the relay policies on the SMTP server
    • If possible, reboot that server or restart those services
  • Add another e-mail address to the "Email To" field that uses a different e-mail server than the one currently in use. (Gmail, etc.)
    • Does the new e-mail address receive the "Test Email"?