Configure Exchange 2007 to relay emarketing emails from a hosted server

I am looking for the best practices and advice on setting up Exchange 2007 (EBS environment, Edge Transport Role is on a MS Forefront/TMG server, the rest of the Exchange roles are on a dedicated server) to allow emails (newsletters and such) sent on the company's behalf from emarketing software running on a hosted server.
The Edge Transport Role server has a receive connector configured for the hosted server. SPF for the sending domain includes the hosted server's IP address.
Currently, emails go through Ok but it takes extremely long time to send them all. The number of recipients can be within a 50-80 K range.
IT-NYCAsked:
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mchieffCommented:
You could increase the maximum no. of outbound connections the transport role server uses. This should speed it up but your always going to take a while to send that no. of emails.
The outgoing route could be throttled by your ISP as well, it is worth asking if they have filtering on your next hop server
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IT-NYCAuthor Commented:
Thanks for the reply. I am going to just change the settings on the transport role server and will monitor the traffic next time enewsletter is sent. I also enabled logging on the receive connector.
ISP does not use throttling.
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