Hide SMTP Greetings?Sendmail/Qmail/Postfix/Exim?

for sendmail

Modify:
locate sendmail.cfnano -w /path/to/sendmail.cf
Code:
SmtpGreetingMessage=$j Sendmail $v/$Z; $b
restart Sendmail or reload configure file?killall -HUP sendmail??

for Qmail

Modify:
qmail-smtpd: smtpgreeting
Code:
mail.example.com Greetings here

for Postfix?
Code:
locate main.cf nano -w /path/to/main.cf
Code:
smtpd_banner = $myhostname ESMTP $mail_name ($mail_version)

reload Postfix?EximExim is similar with Postfix,modify /etc/exim.conf smtpd_banner


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