SMTP setup is fragile about ultimonitor

[astrobokonon]

One solution is to just run printzini in a container, and reference the SMTP server via the container name alias...but I'm not ready for that yet.

[astrobokonon]

Another option is to just ditch the SMTP server entirely, because it's fiddly and a spam target and it's probably easier to just use a @lowell.edu email. I'll start working on that.

[astrobokonon]

Could at least just set up the mail container with a static (private, docker) IP address too.

[astrobokonon]

Decided to ditch it all and just use gmail + authentication. Too easy to screw up with the relay I had going to create a spam vector. Initial changes occured around 42fc1ea but it's wrapped up in the general async temperature logging changes too.