Depends on whether you have an E-SIGN agreement or have established an agreement of accepting email as a written notice. E-SIGN would be pretty solid, "here is how we'll contact you and you may respond." Otherwise, if I was the customer I might say the bank and I have emailed many times and established this as a valid means of communication. The reciprocal wouldn't be true because the bank knows "written" means written or E-SIGN. But if the bank accepts emails as written, it may be considered an established practice.
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AndyZ CRCM
My opinions are not necessarily my employers.
R+R-R=R+R
Rules and Regs minus Relationships equals Resentment and Rebellion. John Maxwell