What tone to use with tenants over email?

[Salvador Santolucito]

For background, my tenant has decided not to renew and we are having an e-mail exchange regarding move out and property maintenance.

What sort of tone do you normally take with your clients over email?  Do you generally use a relaxed normal speaking tone?  Or do you try to sound official and use legalese?  Do you reference every request you make to a section in the lease?

My tendency is to speak like a normal person and only reference sections in the lease as a last resort.  For some reason my tenant keeps responding in a super "professional" tone referencing sections of the lease every other sentence. 

What's the norm?

Thanks,

Sal