Nguyen Nang Thang: > > Postfix sends: > > > > 220-myhostname ESMTP > > > > Postfix waits $postscreen_greet_wait seconds. > > Bad SMTP clients will greet before $postscreen_greet_wait seconds > > have passed. > > > > 220 myhostname ESMTP > > > > Good SMTP clients will greet now. > > Wietse: > Thanks for your detailed explain. Can you suggest me technical ways to > manually test Bad SMTP clients > that greet before $postscreen_greet_wait seconds have passed?
echo whatever | nc host 25
Wietse
