Can I send cash and have it transferred?

You can send cash with Ria Money Transfer: you pay the amount in cash at the counter. You can have the money deposited on the bank account of your addressee in some countries. For that, you need your addressee's account number (IBAN for Europe) and the name and BIC code of his or her bank. The counter clerk in your Post Office will tell you which countries allow this.
Please note: you cannot transfer cash to a bank account in Belgium. Your addressee must pick up the cash at a Post Office or Ria agency.