can you put 2 mailboxes on this pole using a bracket. If so what bracket is recommended

Thank you for your interest in our products. Yes, this post can support two mailboxes. We don't have a dual mounting bracket, but you can fasten a wooden board to the mounting plate and fasten the mailboxes to the wood board. Ensure the mailboxes are balanced so that the weight is distributed evenly on the post. If you have any other questions give us a call at 1-800-647-7063.