Can not see sender’s email address

Hello,

I’ve embedded Contact Form 7 on my website for a while and everything went well until we received visitors messages.
The awkward thing is I can not see the visitor’s email and I cannot reply to him/her. The email address is exactly what I use to receive the messages but not the visitors.

It’s not the purpose that I can only view and reply the message to “myself”.

And when I tried to change the “from” field to [your-mail], I got the error: “email address does not belong to the same domain as the site”.

1. I just want my visitors to simply submit inquiries or messages to me without registration;
2. I can simply reply to the e-mail address which is left by the visitor.

That’s all the Contact Form function I want. Is there anyway I can do this?

Thanks in advance!

Promo-U