Am 23. Jänner 2016 04:30:02 MEZ, schrieb Nguyen Nang Thang <than...@iwayvietnam.com>: >----- Original Message ----- >> From: "Wietse Venema" <wie...@porcupine.org> >> To: "Postfix users" <postfix-users@postfix.org> >> Sent: Saturday, January 23, 2016 9:57:40 AM >> Subject: Re: Postfix Postscreen Pregreet Test > >> 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: >I dit my test as below: ># nc localhost 25 < /tmp/postscreen-greet-wait.txt >The output: >220 gw.mydomain.com ESMTP Postfix (2.10.1) >250 2.1.0 Ok >250 2.1.5 Ok >354 End data with <CR><LF>.<CR><LF> >250 2.0.0 Ok: queued as 35CA025E69 > >The postfix/postcreeen log does not show info "PREGREET count after >time from [address]:port text...", >test message delivered normally (expect: test message prevented by >postscreen). >So, is there another way to quickly make smtp connection via "nc" or >another tool to test the parameter >"postscreen_greet_wait"? Do this test from a different device. You probably have localhost in mynetworks and have configured > postscreen_access_list = permit_mynetworks, > cidr:/etc/postfix/postscreen_access.cidr
>Thanks. > >Regards, >N. Thang -- Christian
