We are not able to send out ".asice" files through the email aliases we set up in HubSpot as it states that "this file typeis not supported".
We need this because our platform is built on this file type for e-signatures and sometimes these files need to be shared via email as an attachment. In my mind, it is a very basic feature that you can add whatever file you need in the attachments of an email.
The whole of Estonia is using this file type for e-signatures plus Latvia, Lithuania and Finland and probably others in the EU as well...