Finally today someone was kind enough to reply.
I did mark it as "People are dying" but even then there was no reply.
Now it is fixed. The problem was the username/passwords were rejected as they moved the mail to different serever. The tech guy told me now that it was permissions issue which are now set correctly.
Finally, our email is back.
But....... for a moment in last few hours I was started to think that quality of dreamhost is going donw as tehy do not even reply tech request.
Anyway, the end is that Iam again a happy customer.