To help a service get unlisted by a spam block list, try the following addresses for each blocking service:
- Cisco IronPort SenderBase Security Network
- Hostkarma / Junk Email Filter (useful as it contains details about blocked emails)
- Trend Micro Email Reputation Service / MAPS
- DNS WL
To get in touch with many major ISPs, these links are of help:
|Hotmail / MSN
I will add to this list as I find more resources that I’m actually using for delisting. Another good source for information on feedback loops is Word to the Wise.