Authoritative guide to configuring Sendmail to use a relay for outgoing mail on FreeBSD?

[Ottavio Caruso]

Hi,

For educational purposes [1], I have to answer the question: "Configure 
Sendmail [...] to use a relay for outgoing mail.

It has be sendmail and not a substitute smtp client such as ssmtp or 
similar.

According to [2], it seems I have to edit sendmail.cf; however. 
according to an older post on this list [3], one would have to run 
"make" in /etc/mail and then edit the generated file, presumably 
`hostname`.mc.

On IRC (freenode/#freebsd), I have been told that I can edit any .mc 
files, then run "make" and that will generate an .cf file. For example 
freebsd.mc >> freebsd.cf.

So, I am basically confused and I wonder if there is a canonical way to 
do that on FreeBSD.

Thanks.

[1] 
https://wiki.lpi.org/wiki/BSD_Specialist_Objectives_V1.0#713.5_Mail_Transfer_Agents_.28MTA.29_Basics_.28weight:_1.29

[2] https://www.freebsd.org/doc/handbook/outgoing-only.html

[3] 
https://lists.freebsd.org/pipermail/freebsd-questions/2004-February/035329.html

-- 
Ottavio Caruso