You’re welcome to use SecureMyEmail™ for all your email, or just occasionally — while still using another email client and/or webmail for general use. We’ll keep everything synced up automatically. The one important thing is that you must use SecureMyEmail™ software to read your encrypted email as it will be encrypted and unreadable elsewhere.
We do plan to add plugins for other major email clients. Still, because our software runs in your browser on PC and Mac and our mobile apps are very comprehensive, we think you’ll fall into a pretty easy workflow when you use it.