pop

早期freebsd实现

localname:	name-of-pop-service-host
mmdfldir:	@(MHDROPATH)
mmdflfil:	@(MHDROPFIL)
hostable:	@(MHETCPATH)/hosts
servers:	name-of-smtp-service-host name-of-alternate-host localhost
pophost:	name-of-pop-service-host