When your Site is in a Bad Neighborhood
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When I first moved from a shared host to a dedicated server, and had my sites set up to send email (to customers), I immediately received rejections from Yahoo, Hotmail, AOL, and many other email servers (this was before there was Gmail). The rejections all shared the same reason. The IP block my server was in was blacklisted. That means that the IP address of my server was within a list of neighboring IP addresses that was blacklisted. It seems people grabbed dedicated servers and used them as spamming machines.

As I mentioned a few months back in 