Everything is LGPLv2.1 (see COPYING.LGPL) unless otherwise mentioned at the

beginning of the file. Almost everything in src/lib/ is with MIT license.

The exceptions are:

src/lib/

- base64.c : BSD-like (read it)

- hash.c, primes.c, strfuncs.c, tree.c : LGPL v2

src/lib-imap/imap-match.c : BSD-like (read it)