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Also, I like sender verification, but that's me.

i used it for some time, and reluctantly shut it down. blocked a lot of email abuse, but too many false positives for my taste.

Could you go into more detail?

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Maybe I have others I just don't know about? How many people send legit e-mail with return addresses which are bogus?

On a related note, for those of you interested, the IADB (ISIPP Accreditation Database) is now up and running, although not publicly announced yet. You can read information about it at: http://www.isipp.com/iadb.php What is unique about the IADB is that it is designed to list not only IP addresses, but also associated domains *if* the listee is publishing an SPF record, and conversely IADB listees will be able to get a unique "accreditation code" to put into their SPF records. Anne Anne P. Mitchell, Esq. President/CEO Institute for Spam and Internet Public Policy Professor of Law, Lincoln Law School of SJ