Another case of trying to avoid the inevitable.
spamhaus.org and rfc-ignorant.org are an important part of your overall antispam arsenal. The only problem is that although many of these services are free, you do need to at least:
- confirm the services are still valid
MX Proxy Extended, using Multiple Instances has been updated to something that works for me. I’m sure there are better solutions out there. But it doesn’t hurt to try, or be exposed to other methods?