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Manual:$wgBlockAllowsUTEdit - MediaWiki

User rights, access control and monitoring: $wgBlockAllowsUTEdit
Allow blocked users to edit their talk pages
Introduced in version:1.5.0 (r10003)
Removed in version:Still in use
Allowed values:(boolean)
Default value:true (1.26+)
false (1.5-1.25)
Other settings: Alphabetical | By function

Set $wgBlockAllowsUTEdit to true to allow blocked users to edit their talk pages (so that they can request unblocking, for example). This will add an "Editing own talk page" checkbox on Special:Block, unchecked by default (see Manual:Block and unblock). If it's set to false, the checkbox disappears.

Basic user rights and block settings: