A number of ISPs have email information and postmaster sites available. I found myself compiling a list of them for a client today and thought that I would put up a list here.
AOL:
Juno/Netzero/UnitedOnline:
MSN/Hotmail:
RoadRunner:
Spamcop:
Yahoo:
Yahoo announced this morning that over the course of the next few weeks Yahoo would roll out a new feature to their email that blocks any unauthenticated email from eBay and PayPal. In a blog post Nikki Dugan says: Our weapon is a technology Yahoo! spearheaded called DomainKeys, which uses cryptography to verify the domain of the sender. In overly simplified terms, if the email’s originating...
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