Tenfourbird ist inoffiziell Build von Mozilla Thunderbird für PowerPC-basierten Mac OS X.
This is Enigmail for PowerPC Mac OS X. (Unofficial build)
You can check integrity of files by RIPEMD160 or SHA512 hashes. It also signed by OpenPGP key of t_mrc-ct[at]users.sourceforge.jp. The public key could get from here or OpenPGP Keysever.
This build based on enigmail-1-8-2