Symptoms
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Standard Roundcube interface is displayed when Plesk Premium Email extension is installed and activated for the example.com Subscription.
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Kolab settings are missing in example.com's webmail configuration file:
# egrep kolab /etc/httpd/conf/plesk.conf.d/webmails/example.com_webmail.conf
(Empty Output)
Cause
The Plesk Premium Email extension's custom webmail template is missing:
# ls -las /usr/local/psa/admin/conf/templates/custom/webmail/roundcube.php
ls: cannot access /usr/local/psa/admin/conf/templates/custom/webmail/roundcube.php: No such file or directory
# ls -lha /usr/local/psa/admin/conf/templates/
total 16K
drwxr-xr-x. 4 root root 4.0K Mar 26 14:43 .
drwxr-xr-x. 5 root root 4.0K Mar 26 03:51 ..
drwxr-xr-x. 6 root root 4.0K Mar 26 03:48 default
drwxr-xr-x. 3 root root 4.0K Jul 12 2017 pci_compliance
Resolution
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Connect to the server via SSH
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Create the custom template folder:
# mkdir -p /usr/local/psa/admin/conf/templates/custom
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Copy the Kolab custom template:
# cp -r /usr/local/psa/var/modules/kolab/webmail /usr/local/psa/admin/conf/templates/custom/
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Set a proper name to the configuration file:
# mv /usr/local/psa/admin/conf/templates/custom/webmail/{roundcube.template,roundcube.php}
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Rebuild the web server configuration files:
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For one domain:
# plesk sbin httpdmng --reconfigure-domain example.com
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For all domains on the server:
# plesk sbin httpdmng --reconfigure-all
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