ENH: filter.d/qmail - anchor at start. Add another regex

 for http://www.tjsi.com/rblsmtpd/faq/ patch to rblsmtpd

Note that despite being a djb qmail suite of tools, the default implementation doesn't log any rejections and the patches that I've found in existence seem to log to syslog rather than the daemontools that normally forms part of qmail (and djb utils). I could be proven wrong on this and will gladly admit defeat with a provided log file.

Even if this filter stuffs up the email is still blocked so hopefully no major damage will occur.

This is a clean up for consistency with other filters.