This is a cleaned up version of the University of Washington's IMAP package, since the original package was unmaintained. In particular, it does:

• Merges all of Debian's patches.
  • Debian seems to have the most extensive set of patches for UW IMAP.
• Modern CMake build system.
  • Automatically detects OpenSSL, PAM, and Kerberos.
  • Assumes modern platform support (i.e. IPv6).
• Removed massively unmaintained tools and daemons.
  • You should use something like Dovecot instead if you were using these.
• Cleaned up OS support, dropping decrepit shims and simplifying build.
  • This package should work on arm64 macOS and Linux, as well as AIX.

It shouldn't be used by new applications, but things like PHP's IMAP extension still use it. This package passes the PHP IMAP extension unit tests, so it works as a drop-in replacement.

The files in docs/ are assumed to be stale regarding OS support.

Use CMake. The following build flags are interesting:

• BUILD_MTEST: Boolean, off by default. Builds the mtest program, which exercises c-client functionality and tests linking. Not installed.
• CMAKE_INSTALL_PREFIX: Path to where you wish to install c-client.
• USE_KERBEROS: Boolean, on by default. Builds with Kerberos support. If Kerberos isn't found when this is on, then generation will fail.
• USE_OPENSSL: Boolean, on by default. Builds with OpenSSL support on Unix. If OpenSSL isn't found when this is on, then generation will fail.

• Reintegrate Windows support
• pkg-config or CMake build files
• Cleanup
  • Remove functionality only ever used by servers
  • Remove various mailbox drivers
    • Probably reduce to IMAP/POP3/NNTP
    • Maybe mbox; maildir is unsupported, other local mail formats are decrepit
    • Leave other drivers as stubs for compatibilities, maybe
  • Run clang-format
  • Clean up warnings, -Werror it
• OAuth2 authenticator