Contact Form 7 is a popular and easy to use contact form.

Recently, it randomly stopped working properly and when attempting to submit the form, it would show the following error message in an orange box, “There was an error trying to send your message. Please try again later.”

I finally found a fix that involved using a different mail send mechanism explained in the description below.

STEP 1: Obviously you must active your contact form plugin on a page.

STEP 2: Download the plugin WP Mail SMTP by WP forms

STEP 3: Activate that plugin

STEP 4: Go to setting

STEP 5: Choose another mailer, if you use good server, you should prefer other and use your server smtp details.

And Save setting.
Click on test tab. Once that pass the test it would show you success. Now try again submitting values on your CONTACT FORM 7.