Xref: utzoo comp.mail.sendmail:1038 comp.unix.ultrix:1817 Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!purdue!decwrl!shlump.nac.dec.com!michaud From: michaud@devax.dec.com (Jeff Michaud) Newsgroups: comp.mail.sendmail,comp.unix.ultrix Subject: Re: Ultr3.1,undocum. mailer flag in sendmail.cf Message-ID: <5020@shlump.nac.dec.com> Date: 29 Sep 89 00:49:02 GMT References: <1128@utkcs2.cs.utk.edu> <1596@esat.kuleuven.ac.be> Sender: news@shlump.nac.dec.com Followup-To: comp.unix.ultrix Organization: DEC Lines: 31 > I believe it indicates to Ultrix sendmail that it should speak a special > extended SMTP to the mail11v3 program. The extended SMTP includes a mechanism > to allow mail11v3 to look at the headers of the RFC822 message before > verifying that any recipients are valid. This makes for a easier interface > to the MAIL-11 protocol, where it's helpful to know what the message headers > look like *before* you open the DECnet connection, and therefore before you > ask the remote MAIL-11 object whether any recipient(s) are valid. Correct. The MAIL-11 protocol uses what's known as optional data associated with a connection request to the remote system. The optional data contains a couple of key pieces of information that need to be known at connection establishment time. mail11v3 needs to know if there is a Cc: line, and it also needs to know if the message being sent is a DDIF/CDA/capsar (or whatever you want to call it :-) message. > Mail11v3 won't work unless you speak extended SMTP to it. This means > you can't use mail11v3 with e.g., Berkeley sendmail. Incidentally, the > extended SMTP protocol (as far as I can tell) is also undocumented. Correct again. I made sure to state that in the release notes. We also don't document the two extra SMTP commands (HEAD and MULT) because I didn't want to commit ourselves to those commands at this point in time. The two extra commands only get invoked if the appropriate mailer flags are defined for the mailer. /--------------------------------------------------------------\ |Jeff Michaud michaud@decwrl.dec.com michaud@decvax.dec.com| |DECnet-ULTRIX #include| \--------------------------------------------------------------/