I've been running a mailserver on my domestic DSL line for almost ten years now. Apart from my private domains it also hosted some domains for organizations, wi

I've been running a mailserver on my domestic DSL line for almost ten years now. Apart from my private domains it also hosted some domains for organizations, with mailing lists. Last year I moved and my IP address changed (ISP didn't). I expected to lose the "reputation" the previous one had built up. But I did not have any problems whatsoever. I do hear rumors like yours every now and again but I have a hard time believing them. I think that large email providers, the likes of Gmail/Hotmail, actually look at the email addresses / domains / servers that their clients send email to. Then they assign trust to those tokens. If you're a large provider, you can do many things with the data you get from your own customer's behaviour. How about looking at accounts that have been in use for some time, seen regular web interface action, and send email to other @hotmail/gmail accounts that actually get read and not flagged spam? If those accounts send mail to my mailserver, then my mail server / domain must have something good going for it. Well that's what I would do if I were running a huge setup anyway... As for incoming spam: I'm using various postfix tricks, greylisting, and dspam. I have no problems. I should write a howto ;-)