Fastmask is a free and open-source application for the Fastmail service.
It makes no claims to be affiliated with Fastmail. It is not endorsed by Fastmail. It is not supported by Fastmail. It is not maintained by Fastmail.
Use of Fastmask is at your own risk. Fastmask is provided "as is" without warranty of any kind. Fastmail is not liable for any damages arising from the use of Fastmask. Fastmail is not liable for any damages arising from the use of Fastmask. Fastmail is not liable for any damages arising from the use of the Fastmail API.