MIME support (including RFC1522 encoding/decoding of 8-bit message headers and UTF-8 support).
Advanced IMAP client supporting SSL encryption and SASL authentication.
Message threading (both strict and non-strict).
Keybindings are configurable, default keybindings are much like ELM; Mush and PINE-like ones are provided as examples.
Handles MMDF, MH and Maildir in addition to regular mbox format.
Messages may be (indefinitely) postponed.
Highly configurable through easy but powerful rc file.
This is a confined snap, so is unable to read the ~/.muttrc. So place your configuration in ~/snap/mutt/common/.muttrc where the snap will be able to access it.