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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.
I hadn't checked this before, simply excepting what the control panel had told me, but can see the quota setting in mailenable when i look in the back end.
Maybe plesk just couldn't figure out how to set it.
Am facing this same problem, i wanna create a client template with a default quota limitation so i dont have to do it manually from the mailenable, but it says Mailbox quota not supported by the mail server, and the option is disabled i sent the PLESK Support an email regarding this issue still waiting for reply.