The MAILER() declaration specifies support for delivery agents. To declare a delivery agent, use the following syntax.
MAILER(`symbolic_name') |
In this new version of sendmail, the MAILER(`smtp') declaration now includes an additional mailer, dsmtp, which provides on-demand delivery by using the F=% mailer flag. The dsmtp mailer definition uses the new DSMTP_MAILER_ARGS, which defaults to IPC $h.