Well the case in question got 420 emails per minute, all failures, all forged emails.
The data coming to the server was too much and the server was crashing due to the incoming fake emails.
The problem is that somebody is sending emails from a fake address e.g. From :
Spammer@somedomain.com - To:
123@aol.com
when the TO: address fails, the failures are coming back to somedomain.com creating a load issue.
The emails are obviously forged / faked headers but are there any solutions to combat this problem.
Is it a problem with this host and would moving to a dedicated / managed server help ?