> Are there any non-internet, unix domain socket(s) which can be used > to send mail to the smtp daemon? i.e. is there any *documented* way > to give mail to postfix for remote delivery that doesn't involve the > tcp/ip stack (other than the sendmail binary).
http://www.postfix.org/master.5.html The above tells you what you need to know to configure an smtpd service on a unix domain socket. Before you do that, however, you may want to try implementing delivering mail using SMTP over a service you have already configured. This will allow you to debug your SMTP dialog before implementing it over a socket connection. If you are sending mail from a shell script, socat includes an example. The TCP/IP protocol stack is a very small part of the delay involved in using the sendmail compatibility interface. You may find that connecting to an existing smtp service solves your performance problems or that there are other optimizations that would have a better return for your time - particularly if the same message payload is being delivered to multiple recipients. Chris
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