Exchange 2010 sending slowly

Our company sends out email blasts weekly to about 20,000 email addresses. On our old Exchange 2003 server this would take about 1.5 hours to send out. On our new Exchange 2010 server it takes about 19 hours.

I've set up a connector that allows the mass emailing software IP to rely off of the mail server anonymously. I've configured the throttling policy as follows

AnonymousMaxConcurrency                     : 20
AnonymousPercentTimeInAD                     : 5
AnonymousPercentTimeInCAS                   : 205
AnonymousPercentTimeInMailboxRPC      : 200

Here is a screenshot of the the full Get-ThrottlyingPolicy
Get-ThrottlingPolicy ScreenShot
It takes about 3.5 seconds per email compared to the old server that took about .25 seconds per email. Any ideas on how to get our speeds up? Do I have the throttling policy all messed up or is there another setting I need to play with?
Who is Participating?
AmitConnect With a Mentor IT ArchitectCommented:
AmitIT ArchitectCommented:
Set everything to blank and then check.
David11011Author Commented:
I only need to change the settings for the anonymous right? there's no default settings somewhere I need to make changes too?
David11011Author Commented:
Thanks! that did it. I created a connector just for the email blasts and set the MaxAcknowledgementDelay to 0 on that connector.

Also I've discovered that I needed to turn of Tarpiting.

set-ReceiveConnector "connector-name" –TarpitInterval 0

Thanks for you help.
AmitIT ArchitectCommented:
Great it worked for you.
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