I'm pretty sure none of our systems have been compromised and forwards mail that we don't know about.
Yet your sending IP reputation is poor....
Do you actually have data that confirms that? We've had random problems mailing Hotmail (frequently), Yahoo! (infrequently), and other places where the mail stream consists of a low volume (<10/day) of transactional and support e-mail directly arising from user-purchased services, on an IP address that had never previously sent e-mail - ever. ... JG -- Joe Greco - sol.net Network Services - Milwaukee, WI - http://www.sol.net "We call it the 'one bite at the apple' rule. Give me one chance [and] then I won't contact you again." - Direct Marketing Ass'n position on e-mail spam(CNN) With 24 million small businesses in the US alone, that's way too many apples.