Follow along with the video below to see how to install our site as a web app on your home screen.
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Debian 11 is approaching its end-of-life (vendor EOL date - August 31, 2026). Plesk Obsidian 18.0.80 will be the last release to support it.
If you are running Plesk Obsidian on Debian 11, we recommend you upgrade those servers to Debian 12 using our dist-upgrade tool.
We plan to deprecate and remove the support for XML RPC protocol versions earlier than 1.6.9.1 in Plesk Obsidian 18.0.82. We strongly recommend that you update all existing integrations using earlier versions of the XML RPC protocol to comply with the version 1.6.9.1 specification.
A self-Signed SSL certificate is used along with PHP 5.6 to run the Horde webmail.
As a workaround, disable TLS encryption for sieve in the Horde configuration file:
Open the file /usr/share/psa-horde/ingo/config/backends.php
Find the section $backends['sieve'] = array(
Change the record:
'usetls' => true
to
'usetls' => false
Save the file with changes.
Create the additional Dovecot configuration file to specify "ssl=no" inside the "protocol sieve {}" section:
# cat /etc/dovecot/conf.d/99-horde-sieve-tlsfix.conf
protocol sieve { ssl = no
}
Restart Dovecot service:
# service dovecot restart