SMTP Server application for Queuing emails

I have a problem with a site that sends out 100+ real estate emails out of a Real Estate application. The application prompts for the following SMTP Server (to send the emails) (port) and Authentication Methods. The clients internet is unstable, as a result of this emails sent to their hosted exchange provider frequently drops connections and only sends 10 out of 100 emails at a time. The OS that the database machine runs on is Windows 7. To resolve this issue I am looking to queue the emails locally and send them in groups of 5 over a 10 minute interval to resolve the issue. However I am struggling to find an application that can provide these features. Can anyone please suggest some applications?
SbsystemsAsked:
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BudDurlandCommented:
What you need is an SMTP server on the WIndows 7 machine.  Windows used to come with an SMTP server that could be configured as a windows feature, but no more.   Most folks now are using hMailServer (http://hmailserver.com).  When the app send a message, specify the IP of the machine running hMailServer.  It will queue the messages up and deliver them as it can.  You may have to configure hMail to use a 'smart host' to relay the messages, depending on your ISP's policies.

Once in the queue, hMail will take care of delivering the messages, and will account any bad connectivity.
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SbsystemsAuthor Commented:
Thanks for your help I am currently testing this and will let you know how I go in a couple of days.
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