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Berkeley Mail was (according to def.h) developed by Kurt Shoens, dated March 25, 1978. I very much regret that it seems impossible to include the people that contributed within the around fifteen years of history of BSD Mail. If you know more about this, contact me. After the 4.4BSD release in 1993, Mail was not further developed officially. The code that Heirloom mailx is based on contains numerous patches from OpenBSD, NetBSD, RedHat and Debian. Namely the NetBSD developer Christos Zoulas wrote much of it. The maintainer and primary developer of Heirloom mailx is Gunnar Ritter. Its development started under the name "nail" in February 2000 and added especially the MIME code, network protocol support, and POSIX conformance improvements. In March 2006, the program has been integrated into the Heirloom project. See the ChangeLog for people who have contributed to mailx.