Unread mail in Squirrelmail being marked as read

I have the junk filter turned on for my domain, and I’m finding that the mail that does make it to my Inbox is generally being marked as read. This is bad because I’m starting to miss e-mails and that’s not a good thing.

Also, it seems like nearly all the e-mail sent to me seems to be marked as ‘Junk’ before I whitelist it. Is this true? Even if the mail is sent directly to me, it’s marked as junk.