[Evolution] Bug#343987: Evolution's junk mail filters don't work anymore

[Yusei]

Package: evolution
Version: 2.4.1-3

Description of Problem:
After upgrading from 2.2 to 2.4 (in experimental), evolution doesn't
check incoming e-mails for spam, and using the "junk" button doesn't
seen to call sa-learn, but just delete the e-mail.

Steps to reproduce the problem:
1. Start evolution
2. All incoming mails are put in the Inbox folder instantly, no time is
spent checking.

Additional Information:
Spamassassin version: 3.1.0a-2
spamd running and accepting connections on port 783, which is the port
that evolution is supposed to use, according to the gconf key. No change
in the spamassassin configuration.