Checking for SPAM with charset=windows-1251 and Earthlink

We added a block in our filtering software to block anything with the Cyrillic charset Windows-1251 recently. It's been working well, catching a few hundred spam messages since being started. However, we've also caught valid email sent by Earthlink customers using Earthlink's mail client.

I've added them, for now, into our allowed domains list. Also, I've sent an email to Earthlink support telling them that they need to fix their problem - we'll see how far this goes.

I'll keep you posted...