Mortgage periodic statements do not require ESIGN if you deliver any other statements to the individual electronically. There is a specific carve-out in the rule that spells this out.
See commentary 41-c-3 and 41-c-4
3. Electronic distribution. The periodic statement may be provided electronically if the consumer agrees. The consumer must give affirmative consent to receive statements electronically. If statements are provided electronically, the creditor, assignee, or servicer may send a notification that a consumer's statement is available, with a link to where the statement can be accessed, in place of the statement itself.
4. Presumed consent. Any consumer who is currently receiving disclosures for any account (for example, a mortgage or checking account) electronically from their servicer shall be deemed to have consented to receiving e-statements in place of paper statements.
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Opinion expressed are my own and not necessarily those of my employer.