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Blacklist Lookup

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Blacklist Lookup

Im just wondering, when a dns query is performed against the spamcop blacklist (bl.spamcop.net), is it done against the ip address of the senders domainname or against the senders mailservers ip?

eg: If the sender is joe@bloggs.com and his mx record for that domain is mail1.mailprovider.com is the resolved ip of bloggs.com or mail1.mailprovider.com checked? Or maybe even both?
2 REPLIES
N/A

Blacklist Lookup

Neither.

Spamcop doesn't deal with the senders from address, but the servers used to actualy dispatch the e-mail accross the internet.

So if I have a @microsoft.com address (yes, unlikely), but use the PlusNet servers to send the e-mail. It is the PlusNet servers that the lookup is performed on.

See the "Received:" headers within the e-mail for the names checked.
N/A

Blacklist Lookup

Yes, so the senders mailserver ip is checked..

I think my second paragraph confused things a bit there (i made assumption the MX record belonged to the senders domain which isnt always true), but thanks youve answered my question :lol: