¿Como podemos incluir una imagen de firma en el email?

Google translate:

I would like to include an image in the form of email but does not appear as attached to receive the email the user PC. Some help?

Go to Mail>Edit>Attachments and check Always send Windows Friendly Attachments

Also check Always insert Attachments at end of Message

For the future, not this is the Mac Pro desktop forum but it does not matter for your question

if the good suggestions of lllaass above do not work:

try sending an EMPTY email, with only the attachment, no message.