Hello
I try version 1.7a of Zp and I encountered a problem sending emails with PHPMailer, I searched and I noticed that in the options of PHPMailer, the key "PHPMailer_user" was not filled in.
In the file "class-emailoptions.php, at line 86, I found the key "PHPMailer_use" instead of "PHPMailer_user".
If it’s good, it’s my contribution of the day.

Thanks, good find. It's fixed.