Hi @Facundo !
There is actually an open product suggestion to allow more customizability of emails sent from Tulip, which includes the 2 points you have above: Request for Enhanced Email Functionality in Tulip Application. Check it out and make sure to vote the help influence priority of this suggestion!
In the meantime, you can try using something like the SendGrid connector https://tulip.co/library/connectors/sendgrid-connector/ to achieve some more customizability here.
Let me know if this helps!