(PHP 4, PHP 5, PHP 7) Append a string message to a specified mailbox

(PHP 4, PHP 5, PHP 7) Decodes a modified UTF-7 encoded string

(PHP 4 >= 4.0.5, PECL vpopmail >= 0.2) Add alias to an existing virtual domain

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

(PHP 4, PHP 5, PHP 7) Create a MIME message based on given envelope and body sections

(PECL mailparse >= 0.9.0) Parses a file resource

(PHP 4, PHP 5, PHP 7) Open an IMAP stream to a mailbox

(PHP 4, PHP 5, PHP 7) Alias of

(PHP 4 >= 4.0.5, PECL vpopmail >= 0.2) Get text message for last vpopmail error

(PHP 4 >= 4.1.0, PECL cyrus 1.0) Bind callbacks to a Cyrus IMAP connection