Hi, have same problem here.
I don’t have Contact Form 7 installed (I use wp_mail).
Everything worked fine until now, but now upgraded to WordPress 4.6 and Postman SMTP 1.7.2 installed, when sending test email the plugin warns me about ajax error.
The mail is delivered, but when my own contact form, which uses ajax to send mails with wp_mail, doesn’t work properly. The messages are sent, but there is no response from server, so the visitor stucks with the progress indicator, and never knows if his email has been sent or not.
I would highly appreciate if somebody could help with this.
Maybe the problem is my side, although came with the upgades.
