Don't forget that "consent" is hardware/software specific. If you plan to use two different e-delivery methods, then your minimums for both must be disclosed.Consent becomes official ONLY after the customer passes a "test drive" (demonstration) for each method. It sounds like you may need to supplement (or replace) your pre-consent ESIGN disclosures to include the minimums for the use of ordinary email, and then you need the customer to demonstrate success with receipt of e-documents via email.
As an ongoing practice, you want to obtain each applicant's consent for e-delivery of all notices and disclosures (especially the AAN) at the time s/he submits the loan application.
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...gone fishing.