geekmansworld writes: "Our business is entirely dependent on e-mail to function. We have our own server and maintain it scrupulously to make sure we optimize legitimate receipt versus deletion of spam. All our major clients' domain names are SA whitelisted to avoid blocking. Increasingly, we've had trouble receiving messages sent through certain ISPs. We've poured over the mail logs, but the messages never even got to our servers (we have primary and secondary MX). It's no secret that spam is overwhelming these days. I wonder, is e-mail now so unreliable that it's a dead medium of communication? How are other server admins coping with email recently?"