Is there a way of parameterising the Send Mail Mailer ?
I’d like to parameterise the send mail component to send from each client’s own SMTP server (e.g outlook, ecxhange, 365, Gmail) in a multi-tenanted environment …
Other than that, you can try manually editing the JSON of the server action/mailer to include the dynamic expression, and see if it works - maybe it was just missing in the UI