I have a WordPress installation with Contact Form 7 running. It worked flawlessly until some days ago!!! So something changed on the server... but I did not change anything. My website is: http://batteryscore.com Now Contact Form 7 is not able to send any more mails. I'm always getting "Failed to send" errors. I've tried to solve it by installing a plugin: WP-Mail-SMTP But I'm not able to figure out the correct settings. I need: SMTP Host SMTP Port Encryption Authentification Username Password I tried the settings that are working in my email program but I'm always getting error messages. The following From address failed: firstname.lastname@example.org : MAIL FROM command failed,MAI, BAD Command does not exist or is not implemented Can please someone fix this?