My client is on Exchange 2010 and using Barracuda SaaS as their mail gateway hub to forward mails to the internet. What is happening is a particular user is sending out mails to a DL and there are many users from different domains that are part of that DL.
So what happens is Barracuda wasn't able to deliver messages to some of the email addresses in a recipient DL , it reports Delivery Failure for all the addresses in that list to the sender.
An investigation was done and the issue identified is shown in the below URL :
https://campus.barracuda.com/product/essentials/doc/70587651/outbound-rate-control/
So the solution given was to create a separate send connector in Exchange and and a transport rule for certain messages and bypass the spam filter for these large email blasts.
But how would Exchange know to direct specific emails to the "New" Transport rule and having Exchange send email directly to the internet , bypassing the gateway , won't it be a security risk?
Can anyone provide any solution to the issue.
Barracuda informed that the limit of sending messages to 150 recipients in a 30 mins timeframe cannot be changed it seems.
Pallab Chakraborty