I'm running small scale mail servers. It's not nearly as difficult as the common folklore makes you believe. Make sure you don't send spam and your server is p

I'm running small scale mail servers. It's not nearly as difficult as the common folklore makes you believe. Make sure you don't send spam and your server is properly configured. If you are sending mails to people that don't want it then it is spam. "They silently agreed to get our newsletter because it was listed in our ToS on page 357" is not acceptable. No other excuse for sending spam is acceptable. Whenever you send any automated mail there must be an easy way to unsubscribe. A few more tips: * Check your mail server on http://multirbl.valli.org/ http://multirbl.valli.org/ - if it's in any blacklist try to find out why (there are a few rogue blacklists, ignore them). * Hotmail allows you to receive a report for every mail that a hotmail user thinks is spam. Use that. Act on it. * Check your logs for messages that indicate that others think you're spamming. * E-Mail forwarding is a tricky business these days. Avoid it. I occasionally get dubious spam rejections, but they don't come from the large hosts. They usually come from some small ISP using a proprietary antispam solution that gives you no insight what's going on. My suspicion would be that qmail is your problem. There are a great many details that a mail software has to get right, qmail often doesn't do what the email ecosystem expects.