>> But I have to consider customer sites patterns with heavy facebook >> users seeing tons of fb notifications and see if a simple check can >> add to the optimization.
Assuming you make the generally useful optimization to do the body hash only once, it's hard to see a significant load from an extra signature check. If it's the same signature, you'll already have the validation key in the DNS cache, so it's just the cost of the header hash, which will be small since headers are small, and the signature verification. R's, John _______________________________________________ NOTE WELL: This list operates according to http://mipassoc.org/dkim/ietf-list-rules.html
