Autor: Dean Brooks Data: Dla: exim-users Temat: Re: [Exim] Verisign pulls a fast one
On Tue, Sep 16, 2003 at 01:25:58PM +0200, Kristian Koehntopp wrote: >
> On Tue, Sep 16, 2003 at 01:11:00AM -0700, Pat Lashley wrote:
> > >rcpt to: <testtest@???>
> > >550 User domain does not exist.
> > >
> > >[It's an unauthorized relay, Verisign, not a non-existent domain.]
> >
> > I'm a bit surprised that they run a MTA at all on that server.
>
> They have to, or mail queues all over the world will be clogged with
> undeliverable mail.
>
> If you send mail to an invalid domain, there is no MX. The
> mailer will try to connect to the A record, which is
> gratitiously provided by Verisign. If there was no port 25
> connect, that mail will be queued at the sender for 5 days or so
> until a bounce is being generated due to server unreachable.
What an ingenious way to collect sender email addresses from people
trying to reach (potentially sellable) nonexistant domain names...
