AOL ######.
<-- censored, try to guess what i have wrote )It's a very common shared server problem to get blacklisted by AOL, I have a personal vps server currently blacklisted... Also, is hard to get unlisted...
but... well, I have not many AOL friends/customers
QUOTE
Plus, having many hundreds of shared users on your host means you WILL have these problems!
It's not a directly relation with the accounts number on a server, I have some VPS with only 2 domains and I get the shared IP blacklisted due to the exploit by spammers of a bad coded phpmailer script.
bad people, bad programmers, bad luck