Manual:$wgAdditionalMailParams/en

From Linux Web Expert

<translate> Email settings</translate>: $wgAdditionalMailParams
Additional email parameters, will be passed as the last argument to mail() PHP function call.
<translate> Introduced in version:</translate>1.17.0 (r75557)
<translate> Removed in version:</translate><translate> still in use</translate>
<translate> Allowed values:</translate>(string) or null
<translate> Default value:</translate>null

Details

Additional email parameters, will be passed as the last argument (additional_parameters) to the PHP mail() function call. See the documentation of the mail() function.

Ignored when $wgSMTP is set.