: 550 blacklisted on Spamhaus I received the following message failure response: Delivery to the following recipient failed permanently: xxxxx@xxxxx.com Technical details of permanent failure:

@LarsenBagley505

In many instances even though the error message returned states that Spamhaus was the reason for the block this is a template error message and it could be from any number of blacklists. If you do a blacklist search using mxtoolbox.com/ for both the domain and for the IP address that will search all blacklists to see if you are blacklisted anywhere.

In addition as @closetnoc states in his comment many high traffic sites cache the results of blacklist checks and some even fill their own blacklists based on regular data dumps from other blacklist providers and so even if you have been removed from all blacklists it can sometimes take anywhere from a few days to several weeks to be completely unblocked from anywhere. You can contact the receiving parties IT department to mention that the block is incorrect and that you don't exist on any blacklists but the most common response I have gotten to this sort of enquiry in the past has been to say that the process is automated and I will just have to wait until the receiving parties systems update their local blacklist or the cached record expires.

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