Last night Thunderbird (running on an i5 iMac in Snow Leopard) started sending messages that all eMail accounts from all domains hosted at DreamHost are being blocked because of invalid security certificates. I've been using TBird and DH for years and had never seen this before now.
Even worse - because I can always check my messages with SquirrelMail (albeit a horrible alternative) - TB also now refuses to open anything, so I can't even access my saved messages.
The error message gives no option for an exception - and keeps popping up onscreen, locking my computer until I cancel the pop-up, even tho both TB and MacMail are fully closed. I did not see similar messages from MacMail - but it is not opening today, either.
One other oddity: The error message does have an option to view the certificate, which shows DreamHost as having a valid certificate through 2017. But it also says it could not validate that certificate "for unknown reasons". I would copy those messages, but they don't allow copying and I can't even type them here while the message is open.
In addition to all my current business and personal eMail accounts, I'm in the process of launching a new online marketing effort that is now at a dead stop because no one can use that business' eMail accounts, so resolving this issue is urgent.
Anybody know anything about this?