Increase Interspire Email Rates when using Amazon SES

Avg Bid (MXN)
Project Budget (MXN)
$500 - $1800

Project Description:
Hi I'm currently running interspire email marketer 6.1.0 (IEM)
and using amazon SES as my smtp relay service.
right now IEM is installed on my VPS

so i need help with the following items
-- modifying IEM to sign emails with DKIM
-- setting up DKIM and any other related DNS settings to ensure maximum deliverability
-- speeding up the sending rate of IEM when sending thru amazon ses

right now it takes about 3 hours to send out to a list of 5,500
i understand this is due to IEM making only one connection at a time to amazon SES.

What I would really like is someone with the appropiate experience to modify IEM to be make multiple connections (multi thread) and therefore
send out faster, that is the main thing I need, speed!

Skills required:
Amazon Web Services, Interspire, PHP
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