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I read a little bit about what your app does -- scan for open ports.

I think "native" promotion is the best. Figure out who your best customers could be and start watching ports on all their websites. Whenever one changes, send an automated email saying something like:

"We noticed a potential vulnrubility in your site, if you'd like to know if this happens again, reach out to me"

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Do not do this. If somebody started running port scans against me and sending me unsolicited emails about "potential vulnerabilities," I'm marking it as spam and reporting them to their hosting provider if I can track it down. It's way too close to the "it'd be a shame if anything happened to your site" thing that companies I've worked for have gotten for comfort.

Thanks for taking a look at it! I like the idea of "native" promotion, and I think you just made me realize another problem I have -- I'm not actually sure who my best customers could be. I've just thought of it very broadly as "people with websites". I'll think more about that...

rethink it as "people who care A LOT about having their website hacked"

maybe as the other commenter said, you don't send a million emails, instead you could do a twitter account or some other social media way to do it.

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