PHP Manual . ... PHP 3 <= 3.0.18, PHP 4 >= 4.0.0) imap_scanmailbox -- Read the list of mailboxes, takes a string to search for in the text of the mailbox . array imap_scanmailbox ( int imap_stream, string ref, string pattern, string content) . Returns an array containing the names of the mailboxes that have content in the text of the mailbox. This function is similar to imap_listmailbox() , but it will additionally check for the presence of the string content inside the mailbox data. ...