Lars Ingebrigtsen <larsi@gnus.org> writes:

> Philip Kaludercic <philipk@posteo.net> writes:
>
>>From time to time I get error messages like
>>
>> nnmaildir--article-set-flags: Couldn’t find article file
>> /home/philip/Mail/Pers/Sent/cur/1631002186.M670797P704685Q0.icterid:2,S
>>
>> when trying to send a message.
>
> I don't use nnmaildir myself (and I'm not familiar with how maildir
> works, really).  Can you propose a patch to fix this yourself?  :-)

I found out that the issue is not the UID, but the flags. Specifically,
when I open a message via Gnus, leave it open for a while, perhaps check
the message on my phone or some other device, and then return to Gnus,
it might have happened that the flags (included in the file-name) were
updated by mbsync.

This patch attempts to find a similar file, and renames that file
instead of the one Gnus remembered. It seems to be working for now, but
I'd wait a bit until I had more time to test it before applying it: