Possible future directions

Inbound filters

qmail-qfilter-dkimverify could be a filter that verifies DKIM signatures. I’d list it (first) in control/smtpfilters.

qmail-qfilter-srsreverse could be a filter that SRS-unwraps envelope senders. I’d list it in control/smtpfilters.

qmail-qfilter-headerchecks could be a filter that checks headers in the Postfix style, against a list of regexes in control/headerchecks. I’d list it in control/smtpfilters.

qmail-qfilter-{mimeheaderchecks,nestedheaderchecks,bodychecks} could round out the Postfix-style filters.

qmail-qfilter-milters could be a filter that runs the sequence of milters in control/milters.

Recipient checks

qmail-rcptcheck-verify could be a RCPTCHECK-compatible program that verifies recipients using Andrew Richards’s qmail-verify.

qmail-rcptcheck-cvm could be a RCPTCHECK-compatible program that verifies recipients using Bruce Guenter’s cvm-qmail.

qmail-rcptcheck-spamdyke could be a RCPTCHECK-compatible program that verifies recipients using Sam Clippinger’s spamdyke-qrv.