Log Message:
Update to 1.0.23, fixing a security problem.

Version 1.0.23:
- No significant changes.

Version 1.0.22:
- A new command 'received_header' with a corresponding '--received-header'
  option allows to disable the default Received header if required.
- A new command 'passwordeval' with a corresponding '--passwordeval' option
  allows to set the password to the output of a command.

Version 1.0.21:
- No significant changes.

Version 1.0.20:
- Added support for authentication mechanism SCRAM-SHA-1 via GNU SASL.
- The new command tls_fingerprint allows one to trust one particular TLS
  certificate, in case tls_trust_file cannot be used for some reason.
- The new script mpop-gnome-tool.py manages Gnome Keyring passwords for mpop.

Version 1.0.19:
- When using OpenSSL, mpop now correctly handles NUL characters in the Common
  Name and Subject Alternative Name fields of certificates. This fixes a
  security problem. Note that mpop is not affected by this problem if GnuTLS is
  used.
- Mpop can now handle mail boxes larger than 2 GiB on 32bit systems. Previously,
  this only worked on 64bit systems.

Version 1.0.18:
- Delivery to MS Exchange pickup directories is now supported, thanks to Julien
  Larigaldie.

Version 1.0.17:
- No significant changes.

Version 1.0.16:
- Mpop now also reads SYSCONFDIR/netrc if the password was not found in
  ~/.netrc.
- Support for the GNOME keyring was added by Satoru SATOH.

Version 1.0.15:
- This version fixes two bad bugs that prevented mpop from correctly retrieving
  mails under certain cicumstances.

Version 1.0.14:
- The configuration command tls_crl_file was added. This allows to use
  certificate revocation lists (CRLs) during certificate verification.
- The configuration command tls_min_dh_prime_bits was added. This is needed to
  use TLS/SSL with servers that use a small Diffie-Hellman (DH) prime size.
- The configuration command tls_priorities was added. This allows to fine tune
  TLS/SSL session parameters.

Version 1.0.13:
- Support for the Mac OS X keychain was added by Jay Soffian.