This article outlines what actions are to be taken when a GrowthZone Owned IP address shows up on a blacklist.
When our email IPs are blacklisted it can cause deliverability issues for our customers but it doesn't mean it will. It's important to communicate to our customer base that we're aware of the blacklisting of our IP address and we are working to resolve this as quickly as possible. We do however need to determine if the blacklisting is causing a delivery impact before worrying our customers. Some blacklists, UCE Protect for example, impact less than 1% of email inboxes and therefore once this was learned we understood that this blacklist can be ignored in the future.
Resolution
Investigate
- Using the alert link open rbltracker.com (or use another tool such as mxtoolbox) and see what blacklist is reporting a listing.
- Follow the documentation on that blacklist to determine what the cause for blacklisting may be and what options are available for delisting.
- Before requesting a delisting we need to understand how we were listed, what customer caused it, and what has been done to prevent future listing.
- Most blacklists will not cause an impact to deliverability the big 8 referenced here are of primary concern.
- Use available free options (if any) at the blacklist provider to request a delisting.
- If no free options exist consult the platform engineering team for further direction/decisions.
Ignored Blacklists
Some blacklists have been ignored in our monitoring due to previous investigations. Information about those is found below.
- UCE Protect (levels 1,2,3) Per a ticket with sendgrid this blacklist is honored by < .1% of inboxes they deliver to and therefore they won't be making any effort to be delisted.
- SORBS spam - We ignore this one for our default GZ IP(s) and for ChamberMaster's Standard IPs due to business decisions we allow users to send to unverified email addresses causing these IPs to be commonly listed.