Postfix/main.cf/mailbox command

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About

  • parameter: mailbox_command
  • default: (empty)
  • versions: ?

Optional external command that the local delivery agent should use for mailbox delivery. The command is run with the user ID and the primary group ID privileges of the recipient. Exception: command delivery for root executes with $default_privs privileges. This is not a problem, because:

  1. mail for root should always be aliased to a real user and
  2. don't log in as root, use "su" instead.

Environment

The following environment variables are exported to the command:

CLIENT_ADDRESS
Remote client network address. Available in Postfix version 2.2 and later.
CLIENT_HELO
Remote client EHLO command parameter. Available in Postfix version 2.2 and later.
CLIENT_HOSTNAME
Remote client hostname. Available in Postfix version 2.2 and later.
CLIENT_PROTOCOL
Remote client protocol. Available in Postfix version 2.2 and later.
DOMAIN
The domain part of the recipient address.
EXTENSION
The optional address extension.
HOME
The recipient home directory.
LOCAL
The recipient address localpart.
LOGNAME
The recipient's username.
ORIGINAL_RECIPIENT
The entire recipient address, before any address rewriting or aliasing.
RECIPIENT
The full recipient address.
SASL_METHOD
SASL authentication method specified in the remote client AUTH command. Available in Postfix version 2.2 and later.
SASL_SENDER
SASL sender address specified in the remote client MAIL FROM command. Available in Postfix version 2.2 and later.
SASL_USER
SASL username specified in the remote client AUTH command. Available in Postfix version 2.2 and later.
SENDER
The full sender address.
SHELL
The recipient's login shell.
USER
The recipient username.

Unlike other Postfix configuration parameters, the mailbox_command parameter is not subjected to $name substitutions. This is to make it easier to specify shell syntax (see example below).

If you can, avoid shell meta characters because they will force Postfix to run an expensive shell process. If you're delivering via Procmail then running a shell won't make a noticeable difference in the total cost.

Note: if you use the mailbox_command feature to deliver mail system-wide, you must set up an alias that forwards mail for root to a real user.

The precedence of local delivery features from high to low is: aliases, .forward files, mailbox_transport_maps, mailbox_transport, mailbox_command_maps, mailbox_command, home_mailbox, mail_spool_directory, fallback_transport_maps, fallback_transport and luser_relay.

Examples:

  • mailbox_command = /some/where/procmail
  • mailbox_command = /some/where/procmail -a "$EXTENSION"
  • mailbox_command = /some/where/maildrop -d "$USER" -f "$SENDER" "$EXTENSION"
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