I'm looking for an SMTP testing tool I can use to do tests of configuration changes to Postfix. To do the proper tests I need to carry out the actual SMTP protocol from this program (as opposed to just putting mail in the queue), with TLS, STARTTLS, and login/authentication support, do it from a command line or shell script, and be able to bypass terminal prompts for authentication passwords. Interactive mail clients are just too clumsy to do these tests with (mostly because I need to do tests with a large variety of configurations generated at test-run time).
Anyone ever heard of such a thing? Ironically, it may well be spamware that can do better tests than anything I have seen so far, and that would be a shame. Open source highly preferred, of course (even better if in my favorite languages ... C, Pike, Python). I'm putting together a suite of regression tests. Some will run daily under cron. Some will be run when configuration changes are made. The objective is to verify that every aspect of sending mail is working (or not working as the case may be, such as rejecting attempts to open relay) as intended whenever changes are made.
