(PHP 4, PHP 5, PHP 7) Parses an address string

(PECL mailparse >= 0.9.0) Extracts a message section including headers without decoding the transfer encoding

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

(PHP 4, PHP 5, PHP 7) Read the structure of a specified body section of a specific message

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

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

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

(PHP 4 >= 4.0.7, PHP 5, PHP 7) Returns a tree of threaded message

(PHP 4, PHP 5, PHP 7) Gets the number of messages in the current mailbox

(PHP 4, PHP 5, PHP 7) Converts ISO-8859-1 string to modified UTF-7 text