First of all, you do not need to pay for Mailspring Pro to connect more than four accounts. That was a former Nylas Pro limitation that Mailspring dropped, but the interface wasn’t updated to reflect the change for some reason. The next version does fix the interface, however: Remove the subscription advertisement when you have more than 4 email accounts - #5 by CodeMouse92
As to having a lower-tier Pro subscription, this’ll ultimately be up to the project owner, Ben. However, we have chatted a bit about having 2-3 tiers.
One possible setup might be:
- Mailspring Essential: No Contact Pane or Automatic Translation.
- Mailspring Pro: Same as current Pro.
- Mailspring Global: Automatic Translation (the most expensive API).