sendmail SMTP Authentication small problem

Mike Burger mburger at
Thu Sep 23 11:43:59 UTC 2004

On Wed, 22 Sep 2004, Mike Burger wrote:

> On Thu, 23 Sep 2004, ipsystem wrote:
> > I have made SMTP Authentication with this how-to page.
> > 
> > It work fine.
> > Any one spamer can't send mail via my smtp server.
> > 
> > But he can send mail via my smtp to my_user at without authentication!
> > How to forbid and it too?
> > 
> > I searched in the documentation to sendmail but have found nothing.
> > 
> > Thanks.
> If you know where they're connecting from, you can block their IP, 
> domain, etc.
> You can not, however, enable SMTP-AUTH for your entire mail system, or 
> nothing will ever get into your system.

You know what, I worded this poorly, and I'm betting that there's a bunch 
of rebuttals waiting for me.

Nevertheless, let me restate.  You can't enable SMTP-AUTH for all incoming 
mail to your entire mail system, or nothing will ever come in.
Mike Burger

Visit the Dog Pound II BBS
telnet:// or

To be notified of updates to the web site, visit, or send a 
message to:

site-update-request at

with a message of: 


More information about the users mailing list