[Dovecot] Sending email over IMAP?

[Marc Perkel]

Kenneth Porter wrote:
> On Friday, May 05, 2006 8:42 AM -0700 Marc Perkel <marc at perkel.com> 
> wrote:
>
>> I'm also am thinking about senders like Paypal and banks who are often
>> spoofed. If the limited all their outbound email to sending over IMAP
>> then they might be able to create a more secure sytem and because of
>> their restrictiveness be able to somehow create a less spoofable more
>> identifyable system.
>
> <http://www.openspf.org/>
>
> MTA's can check SPF records when accepting mail and add headers to 
> indicate whether the sending MTA has valid SPF. For example, sendmail 
> together with a suitable milter (I use MIMEDefang and Spamassassin) 
> can do this. Your MUA then needs to check the result and present it as 
> evidence of spoofing.
>
SPF breaks email forwarding.