I am not totally sure I am understanding this. I was hoping you could advise. Sorry for the basic questions.

1. I already have DMARC set up on my e-mail. I basically get an e-mail each day from any server that receives an e-mail from me domain. At least, I think that is what happens! (I don't understand e-mail that much).

What will DMARC report do differently? How will it help me?

2. Is the number of reports in each Tier linked to the number of e-mails I can send/receive? Or will deliverability be affected after I go over that number?

E.g., if I got Tier 1, can I still successfully send/receive mroe than 25,000 emails per month?