A free app for Android, by Fastmail Pty Ltd.

Be more productive and work more efficiently with Fastmail. This email service provider app will enable you to easily access your email, contacts, and calendars wherever you are. With this, you will get instant alerts for new emails your receive in the most important folders for you, so you won’t miss anything urgent or important. This also enables you to filter the notifications you receive. Hence, you won’t be disturbed by unknown senders.

Scheduling meetings and responding to invitations is also very convenient with Fastmail. With this, you will also receive calendar event alerts to ensure that you won’t miss anything on the schedule. Also, you don’t have to worry about annoying ads as this app is completely ad-free.