Google app script coding problem?

I have this sample working OK accept that the email message doesn’t fill up a whole line, it seems to be breaking sentences at 76 to 80 characters and I don’t have any carriage returns in the text. I tested it with gmail and godaddy webmail and the results are the same. I’ve tried just about everything, any coders out there?

https://developers.google.com/apps-script/articles/sending_emails

 

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