mew binary package in Ubuntu Focal amd64

 Mew (Messaging in the Emacs World) is a user interface for text messages,
 multimedia messages (MIME), news articles and security functionality
 including PGP, S/MIME, SSH and SSL.
 .
 The features of Mew are as follows:
 .
  - POP, SMTP, NNTP and IMAP are supported.
  - You can easily display a very complicated structured message.
  - You can start to read messages before they are all fully listed.
  - For refiling, default folders are neatly suggested.
  - You can complete field names, e-mail addresses, receiver's names,
    domain names and folder names.
  - You can easily search messages with keywords etc.
  - Thread, a mechanism to display the flow of messages, is supported.

Source package