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On Mon, Apr 19, 2010 at 11:37 AM, Wietse Venema <email@example.com>wrote:
> Gaby L:
> > Hi
> > I scan with my postfix server with NMap from other location.
> > The NMAP creats report smtp port open (It is OK) but apear Postfix smtpd
> and other information about MTA program.
> > I dont want to apear any information about my MTA server.
> To disclose no information, close the SMTP port.
> Even when you change the smtpd_banner value to say "$myhostname
> ESMTP Sendmail" (this text MUST start with the hostname), the
> server's replies (especially error messages) still reveal that it's
> really Postfix.
Disclaimer :- It may violate some RFCs and possibly break the smtp system
[root@stick ~]# grep ^smtpd_banner /etc/postfix/main.cf
smtpd_banner = "unknown"
[root@stick ~]# telnet 0 25
Connected to 0.
Escape character is '^]'.