Exclude trap
Saturday, 31 January 2009 12:55 Last Updated on Friday, 20 March 2009 12:30
Your domain maybe an exclude trap! The science of spam catching sometimes gives you unexpected results. If you experience a sudden increase of spam it may not be that the spammers got more resourceful. But you accidentally gave them a free pass to your users.
My first advice - check the message headers for "XWall - Global Exclude, white l ist exclude". Since email now comes from sources outside of Exchange like Backbery's, IPhones, hosted web forms and so on. In order to guarantee delivery of emails from these sources admins often implement an global exclude for their domains. All a spammer now needs to do is send the spam with a fake from address borrowing it from one of your users and it's free sailing for them. Try not to exclude your domain(s) via the global exclude - Email From. Instead exclude your ip addresses, host names and such.