37.19 movemail program

When invoked for the first time, Rmail attempts to locate the movemail program and determine its version. There are two versions of movemail program: the native one, shipped with GNU Emacs (the “emacs version”) and the one included in GNU mailutils (the “mailutils version,” see movemail). They support the same command line syntax and the same basic subset of options. However, the ‘mailutils’ version offers additional features.

The Emacs version of movemail is able to retrieve mail from usual UNIX mailbox formats and from remote mailboxes using the POP3 protocol.

The Mailutils version is able to handle a wide set of mailbox formats, such as plain UNIX mailboxes, maildir and MH mailboxes, etc. It is able to retrieve remote mail using POP3 or IMAP4 protocol, and can retrieve mail from them using a TLS encrypted channel. It also accepts mailbox argument in the URL form. The detailed description of mailbox URLs can be found in URL. In short, a URL is:

     proto://[user[:password]@]host-or-file-name

where square brackets denote optional elements.

proto

Specifies the mailbox protocol, or format to use. The exact semantics of the rest of URL elements depends on the actual value of proto.

user

User name to access the remote mailbox.

password

User password to access the remote mailbox.

host-or-file-name

Hostname of the remote server for remote mailboxes or file name of a local mailbox.

Proto can be one of:

mbox

Usual UNIX mailbox format. In this case, neither user nor pass are used, and host-or-file-name denotes the file name of the mailbox file, e.g., mbox://var/spool/mail/smith.

mh

A local mailbox in the MH format. User and pass are not used. Host-or-file-name denotes the name of MH folder, e.g., mh://Mail/inbox.

maildir

A local mailbox in the maildir format. User and pass are not used, and host-or-file-name denotes the name of maildir mailbox, e.g., maildir://mail/inbox.

file

Any local mailbox format. Its actual format is detected automatically by movemail.

pop

A remote mailbox to be accessed via POP3 protocol. User specifies the remote user name to use, pass may be used to specify the user password, host-or-file-name is the name or IP address of the remote mail server to connect to; e.g., pop://smith:guessme@remote.server.net.

imap

A remote mailbox to be accessed via IMAP4 protocol. User specifies the remote user name to use, pass may be used to specify the user password, host-or-file-name is the name or IP address of the remote mail server to connect to; e.g., imap://smith:guessme@remote.server.net.

Alternatively, you can specify the file name of the mailbox to use. This is equivalent to specifying the ‘file’ protocol:

     /var/spool/mail/user == file://var/spool/mail/user

The variable rmail-movemail-program controls which version of movemail to use. If that is a string, it specifies the absolute file name of the movemail executable. If it is nil, Rmail searches for movemail in the directories listed in rmail-movemail-search-path and exec-path, then in exec-directory.