I support you on replacing email. But it should be well integrated to the concept of emails, as 1) I don't want to use another system over my system (only if i

I support you on replacing email. But it should be well integrated to the concept of emails, as 1) I don't want to use another system over my system (only if it replaces my all email system) 2) I need to be able to use opp.io also if not everybody uses it (It's taught to make other to use a new system) 3) Most of my tasks are something to do with emails (as in your example: write an email to the costume)