To help a service get unlisted by a spam block list, try the following addresses for each blocking service:
- Barracuda
- 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
- mx25.net
To get in touch with many major ISPs, these links are of help:
| ISP | Postmaster | Feedback loop | Whitelist |
|---|---|---|---|
| AOL | Postmaster | FBL | Whitelist |
| Comcast | Postmaster | FBL | |
| Hotmail / MSN | Postmaster | FBL |
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.