Email coming through hours later

Al is very fine now, but I have detected an error:

sending from mail1 domain (using webmail) to anothers mailbox in mail3 I get this error:

204.14.107.174 does not like recipient.
Remote host said: 554 sorry, your envelope sender is in my badmailfrom list (#5.7.1)

Sending out of jodohost is perfect.

Good to hear, but now my question is why?
The load should not be much different today, and also syncs going on. Did some client that moved to another server take the problem with them? Just seems odd, maybe there is something to learn here.

the # of smtp connections dropped from 700 to to around 450.

The server is simply getting bogged down during peak hours. We are entering the non-peak period now, hopefully till monday afternoon. We are hoping to take advantage of this period.

Things seem to be looking good for me too!