: Can a spamhouse listing affect your IP long term? Lately I am getting a lot of mail delivery fails like 20% of the time. It used to be less, then some domain on our shared hosting was blacklisted

@Berumen354

The issue here would appear as though the IP for your shared server has been blacklisted by a range of other blacklist companies, and/or the receiving mail servers still have the Spamhaus blacklist in their cache.

Many companies with email servers, in order to speed up email handling times, and decrease overhead, cache the blacklist records from Spamhaus for a pre-defined period of time, especially the DNS based blacklists which may very well be routed through a caching DNS server before being sent to Spamhaus. How long this will last for depends on the receiving companies.

The other thing that it could be as stated above is that the IP has been blacklisted by another blacklist provider. There are well in excess of 100+ major blacklist providers out there, and short of contacting each and every one to find out if the IP has been blacklisted there is a tool that will let you check 95+ of the major blacklist providers, the tool is located at mxtoolbox.com/SuperTool.aspx and can be used to check all of those blacklist providers. The way it works is to type blacklist: {your ip here} into the search field and click on the search button and that will run your IP through all the different blacklist providers.

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