SMTP connect() failed. PHP 7 compatibility?

  • I just installed easy-wp-smtp on two webservers and configured it.
    It worked perfectly on one server (which uses PHP 5.6) but on the other site, which runs PHP 7.1 I get the following error message:
    SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting

    EditAdd: After upgrading the PHP 5.6 server to PHP 7.0, I get the same error.
    EditAdd2: After downgrading back to PHP 5.6 I still have this error.
    As a side-effect, the Apache environment has been upgraded from 2.2 to 2.4, but I don’t expect that to be a problem.

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