Dnia 11.01.2022 o godz. 16:57:21 Matthias Leisi via mailop pisze:
> >> How would it know the difference if it was Thunderbird, or the user?
> > 
> > You can guess by timing.
> > 
> > If the message is moved to spam folder immediately after being fetched by
> > client, then it is an automated filter action. If there is at least a few
> > seconds delay, then it is probably the user manually moving the message into
> > spam folder (the user needs some time to look at least at the subject of
> > the message and click the appropriate button).
> 
> The mail client with its local spam filter may not be connected at the
> time the message arrives in the inbox.  It may come online at a later
> point and move messages to the spam folder with considerable delay.

I'm afraid I don't understand. If the client is not connected, then it will
not fetch (download) the message at that time. If it later downloads the
message and immediately moves it into spam folder (immediately after
download, not after the message arrives) then it is a mark of a filter
action. The client must download the message first in order for the filter
to analyze it and move it into spam folder; it can't move it to the spam
filter without downloading. So if move to the spam folder occurs immediately
after downloading, it is probably caused by a filter. It has nothing to do
with message arrival time.
-- 
Regards,
   Jaroslaw Rafa
   r...@rafa.eu.org
--
"In a million years, when kids go to school, they're gonna know: once there
was a Hushpuppy, and she lived with her daddy in the Bathtub."
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