Re: Fortimail pre sales question
You should look at implementing DMARC. It's specifically designed to look at the Header From address, and not the envelope recipient (a flaw in SPF). It combines SPF, DKIM, and the domain portion of the header From address to come to a conclusion on how to filter the email.
And yes, FortiMail does support SPF, DKIM and DMARC. We switched over from a 3rd party over a month ago and it works great for this.