Hi All;
like many of you, I did hit a roadblock when I had to deal with sending email notifications.
In my case, I am using a Gmail account to send email notifications.
Alex made it clear that NO modifications are needed in any E!A file, in order to make it send emails. It does however need a working mailing subsystem.
Based on my experience so far, I strongly suggest to setup properly the mail subsystem and then install E!A, and not the other way around.
Although it can be done the other way around, it is more logical to set up the mail subsystem first and the E!A, as E!A relies on the mail subsystem and not viceversa.
I am no Linux Guru, but I do know a thing or two. In the case of Ubuntu 14.04 LTS, a working mailing subsystem is "mail" which include Postfix: I have followed the instructions in here ..
... and got it to work.
Mail error massages are always a great guide to troubleshoot the system and are located in
/var/log/mail.log
It works for me; for the record, I am using a virtual server instance on Linode.
Cheers, Stefano.