Email is not sending after WordPress 4.4.1 update

Same problem here.
I have verified that wp_mail function works correctly.
Thank you.

Funny, I saw similar post on CF7: https://contactform7.com/2016/01/15/red-border-error-issue-on-wordpress-441/

I see 4.4.1 updated PHPMailer, I wonder if there is a conflict on your particular WP install? https://codex.www.ads-software.com/Version_4.4.1

Figured out the problem for me. Just had to fill the “from email” with my info@……

I deleted email action and created a new one. All fine now.