The e-mail address entered is invalid.

You can do something like the following:

To: [email protected]
(use any valid email address on any valid domain)
 
From: [email protected]
(use a valid email address on the domain where your form is hosted)
 
Subject: Any text - [your-subject]
(adds extra text to ensure you still have a valid Subject when user does not supply a value)

Additional Headers: Reply-to: [your-name] <[your-email]>
(allows you to use Reply in your email application to reply
 to the form users email address)

So I think I din’t explain my situation well enough. On my site, as a user, if you put your email in, and a subject in, it will say invalid email.
But if the user puts their email in both the subject and the email part, it will send it to me. But if you put the email in the subject section only, it wont send either.

Your explanation was OK & I understood your problems. You’ve clearly got some errors in how you’ve set up your Mail tab.

I included a typical Mail tab to try to explain how many people do this.

The Mail tab is used to send an email from CF7 when someone submits a form.

Just like any normal email you need suitable To: From: & Subject: fields.

Having the same problem and my mail tab is setted like int he example ??