[Mimedefang] Deadline for SPF records

[Cor Bosman]

> >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 :)

Cor