I use DKIM via two independent implementations, perl Mail::DKIM to sign outgoing mail, and C language opendkim to check incoming mail in the SMTP daemon. It is a mature protocol and the implmentations interoperate with no problems I've ever seen. I support promoting 6376 to Internet Standard. Regards, John Levine, johnl@xxxxxxxx, Primary Perpetrator of "The Internet for Dummies", Please consider the environment before reading this e-mail. http://jl.ly