Formatting Auto Responder
The Auto Responder will format your message so that it is displayed properly to your subscribers.
You will usually want to have a carriage return after each line of your email message, so that the email looks good when it arrives in your subscriber's inbox. That is because, their email reader may wrap lines at a different spot than you would want. In addition, this auto responder will convert any curly quote marks into straight quote marks.
Refer to this link for more details: Formatting problems with Plain Text Email
The email is sent to the address firstname.lastname@example.org. The email must come from a list owner email address, or it will be silently ignored.
The subject line may contain a number between 20 and 100, to indicate how many characters you want in each line.
If the subject line does not contain a valid number, then the lines will be wrapped at 70 characters per line.