Power MTA + Interspire open source solutions?

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Hi everyone, I was wondering if anyone knew of any alternatives to Power MTA or Interspire emailers that are open source? If there are other alternatives in the same playing field that are not open source I would be interested as well.

I am already aware of Active campaign, Get response, Amazon SES, Awweber, Send Blaster.

I was just curious if there were any other alternatives out there.

Thanks in advanced
#interspire #mta #open #power #solutions #source

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