Rejected outbound emails

Since the 9th October I am seeing a lot of rejected outbound messages to domains that I had no problems before then. I prey this is not to do with the upgrade which although I was meant to be moved have not as of yet.

Not a word from Comodo and raised another support ticket.

COMODO THIS IS NOT ON AGAIN AN UPGRADE THAT GOES WRONG

Reply from support on this and other issues since upgrade try to blame user and we will pass this on.

NOT GOOD ENOUGH