Preferred Bulk Mailing Setup
Something on the lines of mailchimp.
PowerMTA from port 25 and Greenarrow seem to provide with full fledge web software which simply runs in linux environment. Both handle bounces, multiple clients etc.
The question is, should I go with them and purchase ridiculously expensive stuff they are offering, or configuring postfix in right way would enable linode to send around 100,000 email in an hour ?