[Mimedefang] Deadline for SPF records

[Dave Williss]

----- Original Message ----- 
From: "Cor Bosman" <cor at xs4all.nl>
To: <mimedefang at lists.roaringpenguin.com>
Sent: Tuesday, August 10, 2004 3:16 PM
Subject: Re: [Mimedefang] Deadline for SPF records


> > >Let's say that I work for a hypothetical ACME Widgets, Inc. My e-mail
> > >address is sales at acmewidgets.com. A potential customer,
> > >bob at example.com, tries to send me an e-mail message from his laptop
> > >using a public access point in his hotel. The network he's on is not
> > >listed as an allowed relay for example.com, according to their SPF
> > >record. My administrator (at acmewidgets.com) is honoring SPF
> > >records. What happens?
> >
> > That's just it - if your sales guy is at hotel with his laptop, he could
> > use AUTH/STARTTLS and actually relay through his company's mail server.
> > Thus the email from sales at acmewidgets.com would be delivered by
> > mail.acmewidgets.com to where it needed to go... SPF would be valid.
This
> > no bounce at the destination.
>
> You try and tell that to thousands of customers. Who had their laptops
> set up in 1997 by a company that has long gone bankrupt. And will sue
> you if suddenly their email isnt working anymore :)
>
> Welcome to the world of ISPs :)
>

I assume you mean that you're an ISP and that you've "acquired" customers
from a now-defunct ISP and that they need to be able to send email as if
it came from your domain (say big-isp.com) using whatever server was setup
on their laptop by their previous ISP.

1. What server are these laptops configured to use?  If the old isp is gone
    wouldn't their servers be too?  Surely the customers must have had to
    reconfigure  to use your server already.
2. Even if they didn't, as long as you know what server that is, add it to
the
    SPF record for your domain and you're set.