YAT servers are extended POP3 server and supoprting servers.
It contains bellow programs.

	yatd		YAT server; extended POP3 server
	ascyd		Apop shared Secret changer for Yatsvr
	yatconfd	YAT configuration daemon

Yatd was was based on Berkeley's popper program and known as
yatsvr before.  Yatd has own extention to POP3 protocol for
WinYAT, commercial product from JEPRO Co., Ltd.  But it still
works as standard POP3 server.  Extention to POP3 is documented
in attached document but in Japanese.