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GNU Anubis is an SMTP message submission daemon. It represents an intermediate layer between mail user agent (MUA) and mail transport agent (MTA), receiving messages from the MUA, applying to them a set of predefined changes and finally inserting modified messages into an MTA routing network. The set of changes applied to a message is configurable on a system-wide and per-user basis. The built-in configuration language used for defining sets of changes allows for flexibility and is extensible. GNU Anubis supports the TLS/SSL or OpenSSL.
GnuPG itself is a commandline tool without any graphical stuff. It is the real crypto engine which can be used directly from a command prompt, from shell scripts or by other programs. Therefore it can be considered as a backend for other applications. Features include: Full replacement of PGP; Does not use any patented algorithms; GPLed, written from scratch; Can be used as a filter program; Full OpenPGP implementation; Decrypts and verifies PGP 5, 6 and 7 messages; Supports ElGamal, DSA, RSA, AES, 3DES, Blowfish, Twofish, CAST5, MD5, SHA-1, RIPE-MD-160 and TIGER; The User ID is forced to be in a standard format; Supports key and signature expiration dates; English, Danish, Dutch, Esperanto, Estonian, French, German, Japanese, Italian, Polish, Portuguese (Brazilian), Portuguese (Portuguese), Russian, Spanish, Swedish and Turkish language support; Online help system; Optional anonymous message receivers; Integrated support for HKP keyservers (wwwkeys.pgp.net); Clears signed patch files which can still be processed by patch.