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Anyone have any experience dealing with SURBL? I have a client who's domain and IP is not listed in SURBL, but their client in China is using SURBL and my client's emails are getting blocked. Can't seem to find how SURBL is blocking them
Could the client in China either have an old copy of the feed, or maybe a Chinese ISP keeps an older copy cached of the feed?
The Chinese client could also whitelist your client.