After moving our site and upgrading Contact form plugin, or site no longer can send emails and one reason may be your template. Please check if this occurs with BfastMagPro:
The orange border indicates that a spammy attempt has been detected by a spam protection module like reCAPTCHA. Seeing the orange border every time is obviously abnormal unless you are a real spambot.
If you get into such situations after upgrading to 5.1.1, you are advised to ensure that the theme you use properly loads JavaScript in the footer area of each page.
We know some theme authors improperly omit wp_footer() call to block scripts from loading. That is one of the worst practices in theme development that will surely causes problems like those explained above. Ask the theme author for a fix if you find your theme has such issues.
(https://contactform7.com/2018/12/18/contact-form-7-511/#more-30175)
