mailx: mailx (a simple mail client) mailx: mailx: Mailx is derived from Berkeley Mail and is intended provide the mailx: functionality of the POSIX mailx command with additional support mailx: for MIME, IMAP, POP3, SMTP, and S/MIME. It provides enhanced mailx: features for interactive use, such as caching and disconnected mailx: operation for IMAP, message threading, scoring, and filtering. mailx: It is also usable as a mail batch language, both for sending mailx: and receiving mail. mailx: mailx: The maintainer and primary developer of mailx is Gunnar Ritter.