Every new macOS introduces numerous internal changes to Mail which make all Mail Plug-Ins incompatible. We at SmallCubed have worked hard to address these changes so you will have a seamless upgrade to High Sierra.
In the past we often required a nominal upgrade fee to reflect the research and development needed to ensure compatibility with the changes in Mail.
With High Sierra we are trying something different. This compatibility upgrade is free and we are asking you to recognize our work by contributing to a tip jar.
If our products provide you with daily value and you would like to thank us for our efforts, please think about making a small contribution.
Your contribution will be greatly appreciated by our small team and will be considered highly by us in the future.
There is no requirement to tip and our products will be fully functional should you choose not to.