isync binary package in Ubuntu Focal amd64

 mbsync/isync is a command line application which synchronizes mailboxes;
 currently Maildir and IMAP4 mailboxes are supported. New messages, message
 deletions and flag changes can be propagated both ways. isync is suitable
 for use in IMAP-disconnected mode.
 .
 The main application was much improved in version 1.0. Those improvements
 lead to interface changes and the application being renamed to mbsync. The
 application isync is now only a wrapper to keep compatibility with earlier
 versions.
 .
 Features:
  * Fine-grained selection of synchronization operations to perform
  * Synchronizes single mailboxes or entire mailbox collections
  * Partial mirrors possible: keep only the latest messages locally
  * Trash functionality: backup messages before removing them
 IMAP features:
  * Security: supports TLS/SSL via imaps: (port 993) and STARTTLS; CRAM-MD5
    for authentication
  * Supports NAMESPACE for simplified configuration
  * Pipelining for maximum speed (currently only partially implemented)

Source package