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Many SMTP servers include the IP address of the sender in the headers (usually the Received header). Just look around, you'll be surprised.


Using webmail would defeat that, though, right?


Not if the webmail implementation passes-on your IP, which it should if you believe Spam is a bigger issue than email sender privacy.

Basically, if a webmail service doesn't pass along your IP, there would be no way for recipient networks to ever block a flood of unwanted email because they could never blacklist, say, yahoo.com.

I read something about this lately... maybe from Paul Buchheit?


Depends on the webmail. Some do, some don't. Easy enough to test for yourself beforehand though.




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