Tenant paying through third party

[Jay Real]

I have a new tenant who wants to pay security deposit and first month rental through a check that is not coming from his account. I got a check from some business address, which tenant should not be related to, in my name for that amount.

Is it a red flag or can i accept that check as form of payment on behalf of tenant. Tenant's background checks out fine.

Is there anything that i should get in written from the tenant about this form of payment.