2018Q4 qmail updates in pkgsrc

I've shipped quite a few improvements for qmail users in the 2018Q4 
release of pkgsrc, the practical cross-platform Unix package manager.

In three sentences:

1. qmail-run gains TLS, SPF, IPv6, SMTP recipient checks, and many other 
sensible defaults.

2. Most qmail-related packages — including the new ones used by 
qmail-run — are available on most pkgsrc platforms.

3. rc.d-boot starts rc.conf-enabled pkgsrc services at boot time on many 
platforms.

With more sentences and a demo: 
https://schmonz.com/2019/01/07/2018q4-qmail-updates-in-pkgsrc/

As always, I'm happy to hear of any failures, or even successes. :-)