Lease agreements should include a tenant’s email address. There are many practical reasons for capturing a tenant’s email. One in particular is for purposes of notifying a former tenant of abandoned property. If the former tenant provided the landlord with the tenant’s email address, the landlord may also send abandonment notices by email and comply with the statutory requirements. See Cal. Civ. Code § 1983. While an email may not substitute for the notice provisions in a lease, the parties may certainly mutually agree to receiving notice via email.