I have resolved part of my proposal, however I am missing the most important thing. I want that when I make a comment, a notification or the same "comment" that I am making on a card is sent to an external email, outside of my work team. I have an idea, but I haven't seen that there is automation to do this. Surely with a power-up but I wouldn't be able to locate which one. I would greatly appreciate your help.
@Aldrin you can use Power-Ups like Sendboard that let you manage emails in Trello, so if you have a contact on a card, you can create automation so when a card moves to a certain list a certain email is sent. or you can literally send an email by creating a comment.
If you don't want to use a power-up, you can do this with native Trello automation if you have a custom field on the card that keeps track of that external email address. Then just make a rule that when you add a comment to a card to send an email in the address section reference the custom field value that has the email address. (More details on working with custom fields in rules: https://support.atlassian.com/trello/docs/working-with-custom-fields/ )
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