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Hi tony34772, did you experience this problem after upgrading WordPress to 4.7.1
If yes, then there are a number of people having the same problems. The author of the plugin says it is a conflict with some other plugin, but i have tried disabling all plugins except Contact Form 7, but there is no change. The problem persists ??

I’m having the same issue!!

I’m having the same issue! It has been going on for the last month, and I’ve followed every single step offered as a suggestion. It is causing us to lose business, so I’m searching for a different form plugin to use. Even if I DO like Contact Form 7, it does me no good if they won’t fix a widespread, persistent issue.

For what it’s worth, I did some debugging and in my environment at least, what’s happening is that the code returning the user-agent for the user-agent checking isn’t returning it.

I commented out the following code in includes/submission.php to check for a valid user agent, and everything works again:

/*
$user_agent = (string) $this->get_meta( ‘user_agent’ );

if ( strlen( $user_agent ) < 2 ) {
$spam = true;
}

*/

Devs, I’m hoping this helps fix it in the next release?

I’m confused what you mean by you commented out the code? Did you add that code in or remove it from the submission.php file?