Here you find the settings for sender e-mail, sender, subject and mail footer. You can also change the template for the mail.
Here you enter the sender address for mailing.
An e-mail have to be set for the subscription to work properly. Ordinary text is not valid.
Enter the text you want to show as the sender.
In this field you enter the subject of the message that will be sent to the subscribers. If the field is not filled in the subject will be taken from Title for the subscription.
Add a footer to the e-mail, if you want to.
Under the tab Template you can change the apperance of the mail.
Read more: Template API.