@Lisa7068
Quite a lot of discussion on this topic here: https://community.withairbnb.com/t5/Hosting/Do-you-let-guests-receive-mail/m-p/964607#M242042
Personally, I do not like it. I make exceptions for certain things, like Amazon packages and food deliveries, but only because I now host just long term stays, i.e. 1-6 months. I absolutely am not happy with guests using my address for any official purposes, such as registering bank accounts, credit cards, social security etc.
As you cannot know what is in the mail if we are talking letters or unbranded packages, it's better to simply say no. Make it clear in your house rules. You will probably get some guests who simply ignore this, but at least it will cut down on the amount of mail.