mxHero not free anymore

--got this mail today---
Hi and Happy Friday!

Thanks for using and loving our mxHero Chrome Extension!

We wanted to let you know that while we wish we could keep providing our services for free, in order to keep our servers running and keep improving our product offerings, we have to start asking our users to pay a small subscription fee. We charge well below any of our competitors' asking prices, so we hope you'll join us as we make this transition!

So, if you want is to keep using the mxHero Chrome extension, we're offering two simple annual subscription options:

mxHero for Chrome Limited - $2.50 / month - Send up to 50 emails per month with the tool

mxHero for Chrome Unlimited - $5.00 / month - Send unlimited emails with the tool

We better use email app such as Send Blaster use our own 1px white tracking image. also use google analytics to track our attachments. Alternatively we can host our file in google drive. convert the sharing url to bitly can we can track the attachments who opened and from where.