(PHP 4 >= 4.0.5, PECL vpopmail >= 0.2) Delete a user from a virtual domain

(PHP 4 >= 4.0.5, PECL vpopmail >= 0.2) Add a new virtual domain

(PECL mailparse >= 0.9.0) Streams data from source file pointer, apply encoding and write to destfp

(PHP 4, PHP 5, PHP 7) Unsubscribe from a mailbox

(PHP 4, PHP 5, PHP 7) Returns a properly formatted email address given the mailbox, host, and personal info

(PHP 5, PHP 7 >= 5.3.6) Fetch MIME headers for a particular section of the message

(PHP 4 >= 4.0.7, PECL vpopmail >= 0.2) Deletes all virtual aliases of a domain

(PHP 4 >= 4.0.5, PECL vpopmail >= 0.2) Sets a virtual user's quota

(PHP 4 >= 4.0.7, PECL vpopmail >= 0.2) Get all lines of an alias for a domain

(PHP 4 >= 4.0.5, PECL vpopmail >= 0.2) Delete a virtual domain