Here are two excellent online tools for looking up a client’s IP to see whether they have been blacklisted when troubleshooting e-mail flow.
For a complete RBL rundown, this is the one:
Our results from this one:
The APEWS listing is for our ISP. The others are not relevant.
And, one that can be used from the sending mail server itself:
Note that this second link has a self-issued certificate so a certificate warning will greet you.
The IP address of the Internet gateway will be automatically present in the Multi-RBL Lookup Tool.
Our results from the second tool:
In our case we use ExchangeDefender both for our incoming e-mail and as our SmartHost. So, we do not need to worry too much about being blacklisted because of our ISP or the IP address we have here locally.
The other listings were due to the fact that we have SMTP traffic restricted to ExchangeDefender server IPs only.
Microsoft Small Business Specialists
Co-Author: SBS 2008 Blueprint Book