Manual:$wgEnableSpecialMute

Email settings: $wgEnableSpecialMute
Set to true to enable the Special Mute page.
Introduced in version:1.34.0 (Gerrit change 511781; git #ed13d3fa)
Removed in version:Still in use
Allowed values:(boolean)
Default value:false

Details

Set to true to enable the Special Mute page. This allows users to mute unwanted communications from other users, and is linked to from emails originating from Special:Email.