Unable to send emails to GMail

Unable to send or receive emails to gmail.

This can happen when the port 25 has been blocked by your VM service provided, due to which any communication on this port fails.

Check if the Port is open using the command

nc -4 -vz gmail-smtp-in.l.google.com 25

If you do not get a success message, then you will need to work with your provider to open the port.