Mac Mail is opened - Welcome window appears w/opportunity to enter email/server addresses - clicked on Continue - Server Certificate Authentication pops up. Cox says it's not theirs and advised against Connecting. Talked w/Genius (they've never encountered this issue) who sent me back to Cox (Level 2 tech) who said that Thawte Premium Server CA did not provide a service to Cox and thought there could be a problem w/Leopard installation. Back to Apple (Call Center - helpful but no resolution). Since Preferences in Mail pulldown wasn't highlighted, Apple also thought there was a glitch in Leopard installation (nah) - did a Utility check (nothing found) and even reinstalled (still doesn't work). Anyone encountered/heard of this or am I doing a solo on this issue?! Thanks!!