Unable to send email on Plesk server using webmail interface (Horde / RoundCube): Could not open secure TLS connection to the server

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    Maghreb Services SARL

    For Plesk Onyx, we found that to get Roundcube to work when this type or error was logged, the following line needed to be appended to /usr/share/psa-roundcube/config/config.inc.php:

    $config['smtp_server'] = 'ssl://%z:465';

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    Alexander Tsmokalyuk

    Added the solution for Roundcube, thank you.

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    Robert Ricci

    Those settings already exist. Still get the TLS error. Firewall port open and port set correctly. Even turned off TLS for the web site and no change.

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    Julian Bonpland Mignaquy

    Hi Robert Ricci please open a suppor ticket with us so we can access the server and check. That error can be cause by different configurations.

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