Manual:$wgEnableUserEmail

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<translate> Email settings</translate>: $wgEnableUserEmail
Set to true to enable user-to-user email.
<translate> Introduced in version:</translate>1.4.0
<translate> Removed in version:</translate><translate> still in use</translate>
<translate> Allowed values:</translate>(boolean)
<translate> Default value:</translate>true (1.5+)
false (1.4)

Details

Set to true to enable user-to-user email via Special:Emailuser. This can potentially be abused, as it's hard to track. This setting can be used to check if SMTP is set up correctly on your wiki.

Requires $wgEnableEmail to be true as well.

See also