Does Landlord Need to Give Notice if Tenant Emails Notice

[Dean West]

Hi BP,

I just took over the management of my properties in Indiana.  One tenant is currently on a month-to-month tenancy.  If they email me with their intention to leave on x date, do I (as the landlord) still need to provide official 30 day written notice too?

I don't think this will happen, I am just concerned that my tenant will change his mind at the last minute and decide to stay (not sure if email notice from the tenant is considered "official" notice).

Thanks in advance!