There appear to be several applications available, however, here's a link to a free, open source SMTP server application you may want to try.
It's called hMail Server and according to the website it easily integrates with most bulk emailing programs...
Download Link:
hxxps://www.hmailserver.cOm/welcome
Note: Replace the x's in the above url with tt and the capital O with a lowercase o, then copy and paste it, follow the brief instructions below, and you're golden.
When you arrive at the website, just click the Download button at the top of the page and then click the Download hMailServer 5.4.2 - Build 1964 option.
BTW, I'm new here so I can't post with live links until I have 5 posts under my belt, sorry.
Enjoy mate!
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