Confirm email problems, addresses do match.

What other plugins do you use?

Do you mean plugins on my Contact page, or on the whole website? If the latter, should I send a screenshot of the list? It’s quite long.

Actually not so long when I looked again. Here is the complete list, including inactive ones (which I guess I should delete):

Advanced Custom Fields
Akismet Anti-Spam
Blogger Importer (inactive)
Categories to Tags Converter Importer (inactive)
Contact Form 7
Duplicate Post
Fluid Video Embeds (inactive)
Gestures by errnio (inactive)
Hello Dolly
inception2 Cookie Law (inactive)
Options Framework
Pin It Button for Pinterest
Pinterest Verify
Really Simple CAPTCHA
Redirection
Simple Page Ordering
TinyMCE Advanced
Vanilla Bean – Icon Setter (inactive)
WebAsYouGo Custom Shortcodes
WP Smush
WP-Menu (inactive)
Toast SEO

• This reply was modified 7 years, 6 months ago by Silhouettist.

Okay. Try switching theme to the default one (twentyseventeen).

I’ve done that. Same result I’m afraid.

Then try deactivating all other plugins.

I think we’re getting there. I deactivated all the plugins and got the same result. I then noticed that, although the error message was saying:
“Validation error: perhaps the email addressees don’t match?”
Actually, a radio list at the bottom of my form also had a message in red saying
“please fill in the required field”
This radio list is not supposed to be a required field, so I hadn’t checked a button.
I did so, and the message sent.
I then reactivated all the plugins that were active before and repeated the test. The same thing happened (message sent OK once I checked one of the radio buttons).
I then tested it with two different email addresses and the message still sent OK!
I then reactivated my original theme, and this time the message would not send, even with a radio buttons checked.
I assume this means that the latest version of your form is not compatible with my website theme, is that correct?
This is a shame as the theme is a custom theme designed by a web designer!
I’m also left with the problem that the confirm-email field doesn’t work (i.e.: the message send whether or not the emails match).

Is is possible to reinstall an earlier version of Contact Form 7? The version before your most recent update seemed to be compatible with my website theme.