flashrebel on "[Plugin: Contact Form 7] Able to receive email but when sent back to sender they never receive"

Contact form 7 handle that somebody is able to send email via your form to your mail box.
If you sending email - then its nothing with contact form, it is handled with your email box - your email provider.
So maybe you start to check if ''reply-to'' is right address. You can see details how to correctly set contact form for this on developer website.