• Debian 11 has reached its end-of-life (vendor EOL date - August 31, 2026). Plesk Obsidian 18.0.81 is 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.

How to install Pear

You can view a list of extensions with:

pear list

If HTTP_Request2 is not already installed then do:

yum install php-pear-HTTP-Request2

Or if this package is not available then you can install outside yum (not recommended) with:

pear install HTTP-Request2

As abdi, mentioned Postfix should already be installed.
 
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