Joshua,

Joshua Branson via 写道：
> It turns out this is fairly difficult.

It shouldn't be.

> joshua@gnucode.me, but I do not appear to be able to send email.

OpenSMTPd debug tracing can be enabled with ‘smtpctl trace 
<subsystem>’ (see smtpctl(8) or use ‘all’ if you like spam) and 
read in /var/log/maillog on Guix Systems.

> Also, dovecot doesn't seem to serve my email.

Fix sending first, then enable Dovecot debugging with either or 
both:

  auth_debug = yes
  mail_debug = yes

> I am also attaching a screen shot of my DNS settings.

This shows up as raw in-line text in both emacs and my RoundCube 
Web mail.

> # if I uncomment this next line, smtpd will break...what's wrong 
> with it?

Well... what does it say?  :-)

> match for any action \"send\""

On this line, you're (correctly) demanding authentication in order 
to send, but you then disable authentication above.

Your only option is to fix it: ‘from any’ would turn your server 
into a blacklisted open relay.

Kind regards,

T G-R