BW> However, this turned out to be a bad idea (kind of), as all messages
 BW> written by myself (exported from my node to my uplink) will get caught
 BW> by the circular path reference checking performed by mutil
 BW> ImportEchoMail when the rescanned messages arrive.
 BW> 
 BW> Is there some way to work around this in order to really get all messages
 BW> imported?

Hmmm this is a tough one.  I am not sure there really is a way around that except I could probably add an option in to disable circular dupe checking. 

You'd have to manually disable it, perform the rescan, and then reenable it.

I'll add this in for you in the next prealpha build.

... Tech support is just a busy signal away

--- Mystic BBS v1.12 A47 2021/12/10 (Windows/64)