On 2018-01-19, Grant Taylor <gtay...@tnetconsulting.net> wrote: > So you don't need to accept mail via /usr/sbin/sendmail (et al).
Correct. > Or rather, that's what you want email to leave the relay through. Correct. >> I want to relay each of those messages by invoking a command-line >> utility that has the same "API" as /usr/bin/sendmail. That utility >> injects the mail into another machine's MTA. > > Okay. > > Aside: I don't know that I would consider that to be an API, but I > do see why you consider it as such. I meant the sematics and sytax of the command line options and the data accepted on stdin and produced on stdout. I probably should have said "usage" rather than API. Since I always use that utility from a Python or Bash program, in my head that's its API. >> In this case, the /usr/bin/sendmail utility transfers the message >> to a different machine's MTA using mechanisms that are beyond the >> scope of my question. > > Okay. > > So it sounds to me like you want a gateway of sorts that speaks SMTP > (as a server to clients) on one side and <some custom non-SMTP > method> (that acts as a client to other servers) on the other side. > Is that accurate? Exactly. > In Sendmail parlance, what you want is a custom mailer. Said custom > mailer would then interface with your custom /usr/bin/sendmail > (emulation wrapper). > > Finally, configure Sendmail to use said custom mailer as the method > to communicate with the smart host. Thanks. I was sort of afraid that sendmail was going to be the answer. :) The last time I ran sendmail was on a Sun-3/60 machine, and I never did quite understand how to configure it... -- Grant Edwards grant.b.edwards Yow! Loni Anderson's hair at should be LEGALIZED!! gmail.com