Thank you for the comment. For security reasons Scailer does not store oauth2 keys server-side and never will be. We will add information about this on the website.

We have not tested the work of the application directly from DMG. Probably this is the reason why it says that the trial period is expired. Try to copy it in Applications.

Scailer connects to scailerservice.azurewebsites.net to check for updates. This is Scailer service for updates hosted on Microsoft Azure. And also Scailer connects to scailerservice.azurewebsites.net to get avatars of contacts. Users can turn off connection for avatars on the welcome screen or in preferences.

What version of dovecot do you use? Is this your installation or mail provider?