Use this tool to check whether or not an IP address is listed on our Good Senders List™ (GSL). Simply enter the IP address you wish to look up in the box below, and press ‘Submit’. (Note for email technologists: do not reverse the IP address! Enter it in its correct forward format and order.) If you don’t have an IP address you want to check at the moment, and just want to test the tool out, you can use the IP address 127.0.0.1 as a test address.
Senders whose IP addresses are listed here on the Good Senders List enjoy optimized deliverability to the inbox, as inbox providers and spam filters are always checking the Good Senders List to see if they are certified with us.