* I couldn't find on the site for which OS I can use it. Only here the clarification of electron made it obvious - but might be helpful for others if you clarify it. * I use Migadu and basically create myself infinite emails to handle different contacts. I don't see any clarification if sending is by default only on the 'main email' (foo@bar.com) or I can also use custom emails for each response (ideally the same as the one on which the email was received (footala@bar.com, foospotify@bar.com, foocarquote@bar.com, etc). I'm not expecting custom filtering for this as a standard of course, just hoping for the ability to send. * Any calendar integration? Can I create/manage events e.g. using my Google calendar? If not, how do you envisage this being done? * Sweet and simple presentation overall - good luck!