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Originally Posted by nedsram
1. NTL block email from sites registered with the SORBS database. Or rather they just fail to respond, so it times out.
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The server will respond with error 421. What hotmail do with this is up to them, but for whatever reason they seem to take a day or so to report the problem.
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This includes any relay used to get the email to you, so the problem isn't necessarily the originating site.
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It applies to the remote mail server that talks to the ntl mail server.
As mentioned below, I always use
Senderbase for checking blacklists.