FakeMX (also known as SMTP Fake MX) is an email service that sits at the highest and lowest priority of servers for a domain and fights against the spammers.
Fake MX records can work like greylisting and often much faster. It doesn't require the installation of new software. What you do is add a fake highest and lowest MX record. Normal email will probably retry but spammers often don't.
Service temporary unavailable
If you want to get rid of some spam using fake high MX records and you want to help us build a blacklist then you can use our host (ultron.sixwishlist.com and hulk.sixwishlist.com) for your fake MX record.
MX 10 ultron.sixwishlist.com
MX 20 mail.yourdomain.com (Your mail server)
MX 30 hulk.sixwishlist.com
...do not worry ,this service is free!