Fix a bug with external mail filter + X-Spam-Flag headers?
We have an external spam filter which sets the "X-Spam-Flag: Yes" header for all email considered spam. Kerio's spam filter is completely disabled for us.
By adding this header, Kerio will still move the spam emails to the users spam folder but sometimes emails with "X-Spam-Flag: Yes" still show in the inbox.
Today I experienced this myself. Checked headers and "X-Spam-Flag: Yes" is really there but it was not moved to my spam folder but left in the inbox.
Son 99% of the time this works but sometimes Kerio seems to fail even if the header is there...
Hope this can be fixed soon.