It's important that we get feedback from email providers about people marking our email as spam.

Here is a list of Feedback resources from - http://www.aotalliance.org/summit2007/2007_presents/803_unsubscribex.pdf

I could not load that page tonight (3/22/2008) so I loaded this page from Google's cache -

http://64.233.167.104/search?q=cache:FwaQ-QJ7yPMJ:www.aotalliance.org/summit2007/2007_presents/803_unsubscribex.pdf+aol+postmaster+junk+mail+reporting+ISP&hl=en&ct=clnk&cd=4&gl=us

Abuse.net - http://www.abuse.net/
AOL - http://postmaster.info.aol.com/tools/FBL.html
Excite - mailto: This email address is hidden from email harvesters via JavaScript

HotmailJMRP -http://support.msn.com/default.aspx?productkey=edfsjmrpp&mkt=en-us

HotmailSNDS - https://postmaster.live.com/snds/index.aspx

Lashback - http://www.lashback.com/resources/

Outblaze - mailto: This email address is hidden from email harvesters via JavaScript

Road Runner - http://security.rr.com/spam.htm#FBL

SenderBase - http://www.senderbase.org/

SenderScore - http://www.senderscore.org/

SpamCop - http://www.spamcop.net/

United Online - http://www.unitedonline.net/postmaster/whitelisted.html

USA.net - http://fbl.usa.net/
 

Additional ones

RoadRunner - http://security.rr.com/spam.htm#fbl