IncaMail is a Swiss Post web service enabling e-mails to be sent securely. It means even personal or particularly sensitive data can be sent via e-mail.
On the latest smartphones, IncaMail messages are opened directly in the mail client (e.g. in the Gmail app). This is done using the “Read” button (if available) or by opening the IncaMail.html attachment.
IMPORTANT: on modern Android versions, the IncaMail app is no longer necessary for reading IncaMail messages in most cases!
There are just a few mail apps or older Android versions which don’t work for reading messages. The IncaMail app is only intended for these cases: install the app and use it to open the IncaMail.html attachment.
The IncaMail app also includes other functions, such as sending IncaMail messages and displaying a logbook featuring the protocols of all messages. These functions are also available directly from the https://incamail.com web service and don’t require the app.
NOTE: IncaMail is not just offered by Swiss Post but also its partners, e.g. “P2 The second Swiss Post” at https://www.p2-incamail.de/