I found the list that had the source code...

The DARK REALM
2:200/605.0@fidonet
39:163/102.0@amiganet
50:100/109@rpgnet

Anders Skargren, SysOp
NC200 Sweden

Filename: CM113SRC.LZH
Source Code to the 1.13 update to Confmail - Requires AmigaDos 2.04.

That was the version Greg had started to work on, but it is only reference
I have found to that source code at all.
--- /X Tosser
* Origin: Amiga Underground BBS amigaunderground.com port 2300 (1:387/29)

Hi To all!
I'm just reliving those days long gone... The conversation here from last
year seemd to be about FidoNet, still alive and kicking. Back in the late 1980's I had my Amiga 1000, then 500, then 2000, and I somehow got the
source code for the ConfMail tosser and did a bit of work to make it work better on the Amiga. Better. Not great. :) Then I passed it off to Greg
Block. When I left the Amiga scene in the early to mid 1990's (so sad!), I
got rid of everything. I would love to get a copy of that old ConfMail
source code just for fun, but none of that ancient FidoNet software seems
to be around anymore, much less the source. I did find one reference to it, though, on a BBS file list text file, but nothing more.
So glad to see there is still life here where things generally semed to be
much more sane than the current internet and social media. Not always, I remember plenty of characters from back in the day... :)
Thanks for letting me ramble!
--- /X Tosser
* Origin: Amiga Underground BBS amigaunderground.com port 2300 (1:387/29)