The Moodle Email Plugin - What You Need to Know - Super Moodle | Moodle and Web 2.0 | Scoop.it
The body of the email is able to be customized from within the language file; and is based upon the email based module of self-registration default. Email messages that are sent out to users can be edited via the language file or by utilizing the language editor within Moodle.

Messages that are sent via Moodle are able to go through either a SMTP server connection or an email function PHP. There are cases in which the email function of PHP has been disabled (this is dependent upon the company hosting the server) in order to prevent emails to be sent via websites that are compromised by spammers.

In order to get around this problem, the configuration of the email can be altered for connection by way of an SMTP server. The SMTP connection is able to link an email with login credentials that will authenticate the email address of the sender. This is beneficial due to the fact that there are servers that will not allow emails that are not authenticated to pass through.

Via Miloš Bajčetić