"Send mail" script; sending via email client: How to define sender account
I am sending out my newsletter to the members in my database.
I have defined a script including the step "send mail", where address, subject, text and so on can be defined.
I choose "send via email client" which in my case is the "Mail" application. (Using mac.)
In "Mail" I have 2 different mail accounts I am sending from, depending on if it is a private mail or a newsletter. In this case I want to be sure that the sender email is my "newsletter" account (address). It seems, however, that I have no control over which account the script is choosing.
Is there a way I con define the email account? I do not find it in the Filemaker Scriptmaker.