In fact, that’s what I’m doing now but there is an inconvenience, not a little, and that is that if you want to do a mail newsletter with a header, etc … you have to write it in html, while with MailPoet 3 you can do it with a visual editor.
I have the knowledge I need to do it, but I have to spend more time on it.
I contacted the developers of the Mailpoet plugin and they confirmed that they can not do anything. They checked the code of this plugin and the trigger for sending the welcome email is not set. I hope the creator (@kasperta) is reading this comment and correct, if possible.