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== Enabling Email Support ==

In order to enable email support, you must specify the `From:` address with "`mail_from`".  Furthermore, you must enable a transport, either by SMTP (use "`mail_smarthost`" to enable it) or by sendmail (use "`mail_sendmail`" to enable it). If you use "`mail_smarthost`" and the server requires authentication, then set "`mail_login`", too. 

 mail_from:: This value is used for the "`From:`" and "`To:`" headers in the emails sent (the "`To:`" has email address privacy reasons, email is not really sent to this address, but we don't want to disclose any real recipient address).

 mail_smarthost:: This is the IP or domain name of an FOLDOC:SMTP enabled server. On a Unix host, you can try to use `localhost`; on a Windows machine this will normally be a machine in your LAN or some host of your ISP.
 mail_login:: This is only needed when you use `mail_smarthost` and a server that requires SMTP AUTH to send mail; in that case, set this to the username and password separated by a space, i.e. `"user pwd"`.

 mail_sendmail:: This is a local command to run to send a message.  If set to e.g. '/usr/sbin/sendmail -t -i', use this sendmail command to send mail.  This is only useful on machines that have a mail transport agent installed.

See also HelpOnConfiguration.

== Email Features ==

MoinMoin currently offers two email-based services, which are explained in the following sections.

=== Sending Login Data ===

If emailing is available, the UserPreferences dialog is expanded with a field "[[GetText(Your email address)]]" and a button "[[GetText( Mail me my account data )]]". The user can enter the email address he provided at registration and then gets an email containing all necessary data to re-login, after clicking the button.

=== Change Notification ===

Any user can subscribe to changes of wiki pages by either clicking on the envelope icon [[Icon(subscribe)]], or by adding a regex to the "Subscribed wiki pages" field of his UserPreferences. The system then sends, whenever a page is changed and the author doesn't uncheck the "[[GetText(Send mail notification)]]" checkbox, an email with the author, a link to the page, and the diff of the change. The author does not get notified of his own changes.