Did you try forwarding a copy(as a attachment) to unblock.request@cox.net? See here for instructions. I was wrong about thisisnotspam@cox.net which is only if email is going to your spam folder or being marked as spam.
BTW I don't think they will reply to any email sent there and it might take a day or two for it to process.
Another option is to create a Gmail account and either forward all your email or create a rule that only forwards you googlegroup emails.
I have tried everything suggested here. So far no luck.
You might need to create a Gmail account or get email from some other provider then. Although the email to unblock.requests@cox.net might take a few days.
I might just see what happens. All of my other emails are coming through fine.
Are you still getting all other emails? Just saw a report of email problems on DSLReports.
