Log Message:
Initial import of qmail-acceptutils, my SMTP AUTH implementation for
qmail. It avoids patch conflicts, adds new user-controlled features, and
is more consistent with qmail's design.

To SMTP-authenticate users without patching ofmipd(8) or qmail-smtpd(8),
compose the following programs into your configuration:

- reup runs a program repeatedly until it succeeds.
- authup offers SMTP or POP3 authentication and calls checkpassword.
- checknotroot refuses to run as UID 0.
- fixsmtpio filters SMTP I/O and exit status to suit authup.