Allow scanner to send mail without authenticating.

[Patric Falinder]

Hi,

Ok so I have a couple of printers/scanners that need to be able to send 
the scanned pages to an email-address. The problem is that they are not 
in my LAN and they can't authenticate at all, And they are on a dynamic IP..

What is the best way to allow the printer/scanners to send mail using my 
email-server if they can't authenticate?
They have a no-ip.org domain that gets updated every time the IP 
changes, which isn't that often.
Can I add this no-ip.org domain in the trusted network and allow it to 
only send to a specific address or something similar? Or is there a 
better way of doing this?

Thanks,
-Patric