On Thu, Sep 11, 2025 at 06:08:11PM -0400, John Levine via Postfix-users
<postfix-users@postfix.org> wrote:
> It appears that devonmors--- via Postfix-users <devonm...@tutamail.com> said:
> >-=-=-=-=-=-
> >-=-=-=-=-=-
> >
> >Can Postfix be tweaked to hide being identified {not the version} by Nmap
> >scans?
>
> I'd guess that changing the mail_name configuration parameter would do it.
> Perhaps:
>
> mail_name = "Zarafa"
>
> R's,
> John
I use the following to do this:
smtpd_banner = $myhostname ESMTP
Without it, the bit where I have it saying "ESMTP"
would be "ESMTP Postfix".
Nmap still knows that it's Postfix, but it takes much longer
to work it out (26.8s rather than 0.5s).
cheers,
raf
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