Log message:
qmail-run: further wordsmithery.

Log message:
qmail-run: document DKIM steps. Bump version.

Log message:
qmail-run: enable DKIM signing when keys are present. Bump version.

Log message:
Take steps toward running under other UCSPI-TLS server implementations:

- Set CADIR in the environment.

- Prefer a separate keyfile for TLS. If it's not present, attempt to
  generate it by copying out the private key from the certfile.

- Don't provide an affordance for overriding the compiled-in cipherlist.

- Be willing to enable TLS without a DH params file.

While here, invent control/localfilters. If it exists, it's a sequence
of filters for SMTP connections on localhost.

Bump version.

Log message:
Depend on qmail-acceptutils 20201214 for fixsmtpio(8) segfault fix.
Bump version.

Log message:
Depend on qmail-acceptutils 20201211 for authup(8) that fixes AUTH retry
under TLS. Bump version.

Log message:
qmail MESSAGE went away; point to its README.tls where I meant to.

Log message:
If any of our several rcvars aren't YES, that's fine: don't exit
nonzero. Bump version.

While here, document in qmail-qread-client that its rc.conf vars are
shared with the qmailqread service.

Log message:
Explicitly ulimit qmailsend. Bump PKGREVISION.

Log message:
Drop -4 from qmailqread, no longer needed by ucspi-tcp6. Bump version.