ST_MAILER
s = stab("arpa", ST_MAILER, ST_FIND);
st = stab("local", ST_MAILER, ST_FIND);
st = stab("prog", ST_MAILER, ST_FIND);
st = stab("*file*", ST_MAILER, ST_FIND);
st = stab("*include*", ST_MAILER, ST_FIND);
st = stab(p, ST_MAILER, ST_FIND);
s = stab(m->m_name, ST_MAILER, ST_ENTER);
case ST_MAILER: