Marketing Email Posted on May 23, 2016 Authors and anyone who works from home – make sure every marketing email you out send has a contact address at the bottom. Using a PO Box is fine! It’s required by US law. Share this:FacebookTwitterGoogle Categories: Writing / Publishing Leave a Reply Cancel reply Your email address will not be published. Required fields are marked *Comment Name * Email * Website Notify me of follow-up comments by email. Notify me of new posts by email.