Ubuntu mail headers are not best practice

[Matthew Garrett]

On Tue, Jun 19, 2007 at 09:02:01AM -0700, Sherman Boyd wrote:
> The default postfix configuration sets the mail header to something like this:
> 
> 220 mx.myhostname.com ESMTP Postfix (Ubuntu)
> 
> This gives anyone who connects to port 25 both the name of your SMTP
> software and your Linux distribution.  There is no reason to disclose
> this information, and from a security perspective it is a best
> practice not to.

In reality, anyone can figure out which mail daemon and Linux 
distribution you're running with a high degree of certainty anyway. 
Hiding this information doesn't actually buy you anything and makes 
debugging various issues harder.

-- 
Matthew Garrett | mjg59 at srcf.ucam.org