Mobile Opt Ins, Desktop Sales?

Has anyone had any experience generating opt in email leads via mobile sources, but then sending offers to them via followup email that require a desktop selling environment?

Or to put it another way, will mobile opt in email leads view their emails on desktop or purely via mobile? I’m curious if anyone has any hard numbers on this.

Here’s why I ask: way back in my direct mail days (before the internet was a glimmer in Al Gore’s eye) we knew that people would consume information or buy the way they did initially. So, when we mailed a sales pitch, we’d always include multiple means of response (fax, mail, phone, and eventually website) with multiple means of payme ...