I finishing my return on Turbotax it said I couldn't efile I would have to mail it in. But because I don't ow anything and I am not receiving a refund do I have to file?

My first question was this:

I used Turbotax to do my return, do we have to mail in our return if we filed Married Filing Jointly and are under age 65 and gross income was less than 20,700?
Your answer was this:

No you do not have to mail in your taxes. You can absolutely efile your taxes.