Update to behaviour of Kmail 5.2.3 (KDEPIM 16.04.3) on Debian/Testing:
Currently, I do not get any more dupes while pipe-through-filtering.
Changes in setup (now: working, before: dupes):
* IMAP now Dovecot (instead of ye olde Binc IMAP used before)
* Filtering now spamc+daemon (instead of spamassassin-perl before)
The spambayes filter is used in addition, which is the same as before.
Seems the bug could be triggered depending on the IMAP server implementation used. I tend to rule out the spamassassin-perl vs. smapc+daemon thing, as I've played with manually injecting sleeps at various steps in the filter processing, to no avail.
Update to behaviour of Kmail 5.2.3 (KDEPIM 16.04.3) on Debian/Testing:
Currently, I do not get any more dupes while pipe-through- filtering.
Changes in setup (now: working, before: dupes):
* IMAP now Dovecot (instead of ye olde Binc IMAP used before)
* Filtering now spamc+daemon (instead of spamassassin-perl before)
The spambayes filter is used in addition, which is the same as before.
Seems the bug could be triggered depending on the IMAP server implementation used. I tend to rule out the spamassassin-perl vs. smapc+daemon thing, as I've played with manually injecting sleeps at various steps in the filter processing, to no avail.