Imknow the mailto command.
But that is not what I am looping for.
And the page you suggesties I already scanned for an answer.
All code sends the mail directly.
I want it to generate the message body tekst included and then open the LN client.
Then the sender can fill in the desired adressen and of nessessary add an other attachment and then zend the mail.

That is not included in one of the codes.