Hi Andrew. Thanks for your question.
Our plugins don’t add any special email “from” code.
If you’re concerned about the aesthetics of what your email recipients see, you might be interested in a plugin like WP Mailfrom II to control WordPress’ email settings.
If you’re concerned about ending up in Junk Mail, you might want to use a service like SendGrid or Mandrill because they can add SPF and DKIM records to their sending of emails, which can help make email services less likely to recognize them as NOT junk.
I hope this information helps.