FYI: Courier-IMAP has had this feature for some time. You can configure it so that any mail message dropped into an IMAP subfolder named (e.g.) "Outbox" will be auto-sent - i.e. piped into /usr/sbin/sendmail. Completely removes the need for SMTP.
Of course, it would really require all MUAs to be rewritten to "hide" this technical backend skulduggery from the end-user. They should just be able to hit "Send" as usual. -- Cheers Jason Haar Information Security Manager, Trimble Navigation Ltd. Phone: +64 3 9635 377 Fax: +64 3 9635 417 PGP Fingerprint: 7A2E 0407 C9A6 CAF6 2B9F 8422 C063 5EBB FE1D 66D1