WP Mail SMTP Ok for TEST. Form not sending?

  • I’ve used WP Mail SMTP on other sites. I love this plugin.
    On this site, hosted on a Ubuntu 16.04 server with ISPconfig and WordPress 4.7.4, my Divi Contact Form is not working. NO problems with other of my sites with this config.

    I’m using SMTP with Zoho.com, SSL and the Test works fine.
    My other WordPress forms mail sending does not work (e.g. Divi Contact Form)

    Is there a way to diagnose and fix this?
    If you can suggest some things to try and which files specifically might give log results? What string would I search for?

    Seems others are having this problem, where the Test works but not other WP forms programs.

    Any hints or solutions would be much appreciated. Thanks.

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