Hi @Guilherme da Silva Moura ,
Welcome to our forum!
According to the machine translation, i understand that you have created an Exchange mail flow rule as mentioned in this article, right?
Minha duvida é se as assinaturas do E-mail só vão aparecer depois de enviar a mensagem? Teria como assim que abrir a caixa de novo e-mail já aparecer a assinatura no rodapé?
If so, as i know, message disclaimers, signatures, footers, or headers will appear after the user sends the email. If you want to make the signature appear in the new email you created, you can try to use Outlook Signatures:
Create and add an email signature in Outlook
Hope to help you!
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