On Mon, Apr 10, 2023 at 06:45:04PM +0100, Chris Green wrote: > > I'll try to narrow this down further by trying a very short list of > mailing list names. > After a bit of chopping and changing the list of addresses in 'lists' I finally spotted my problem. Totally my fault, my program that generates the list doesn't handle quoted addresses properly so there was an unclosed quote in the list of addresses. Not surprisingly that stopped things working.
The source file for the lists on the old system running mutt 1.10.1 hadn't got the quoted address in it (yet) so the error didn't appear there. Sorry for the noise and thank you for being patient with me. You steadily nudged me in the right direction! :-) -- Chris Green