Authoritative DNS (nsd) and email (opensmtpd) runs out of the box with minimal config on very low ram kvms. The documentation is fantastic, installation is easy

Authoritative DNS (nsd) and email (opensmtpd) runs out of the box with minimal config on very low ram kvms. The documentation is fantastic, installation is easy; sysupgrade has been a big improvement, though I wish they'd slow the release cycle a little