Location: Settings > Site administration > Plugins > Message outputs > Email
SMTP stands for Simple Mail Transfer Protocol. The SMTP host is an email relay that will take the email from Moodle and send it to users. You will need to set this only if your server does not allow mail relay. Otherwise, PHP will send out the mail using its built-in mail server. All the email sent by forums and other modules will be sent through this host.
Most SMTP hosts make use of the default port 25 to for listening email traffic. However, occasionally a non-default port is used. In such cases, entering an SMTP host followed by a colon (i.e. :) and the port number should work. For example, if my SMTP host is myemailserver.com and it listens on port 587 or 465 (most common) instead of port 25 I would enter the SMTP host as myemailserver.com:587. Currently, the parameter check is too strict to allow this via the Moodle UI; however, MDL-15923 has been created and resolved to address this. Until then, it can be set via phpMyAdmin using a query statement like:
UPDATE mdl_config SET value='myemailserver.com:587' WHERE name='smtphosts';
Secure SMTP hosts with SSL/TLS
For SMTP hosts that require secure authentication, SSL or TLS you must run the following query:
UPDATE mdl_config SET value='ssl://myemailserver.com:465' WHERE name='smtphosts';
If you set an SMTP server and it requires authentication, enter the username for the account that will be relaying the email from Moodle.
Enter the password for the SMTP user you set previously.
Email sent from Moodle needs to have a return address or many servers will reject it as spam. Some users also want to keep their email private, so Moodle sends all of its email using the noreply address you set here.