- Unable to change mailbox size in Plesk GUI going to Domains > example.com > Email Addresses > Click on the mailbox > Another size. The following error is shown in Plesk GUI:
The specified limit is invalid.
The custom mailbox size trying to be set on the mailbox is limited by the Subscription, Service Plan and/or Reseller's Service Plan settings:
In Subscriptions: Subscriptions > example.com > Customize > Mailbox size
In Service Plan: Service plans > Service_plan_name > Mailbox size
In Resellers: Resellers > John Doe > Customize > Mailbox size
Note: If Plesk Web Admin edition is installed, apply the solution described here
Change the default mailbox size limit for Subscription or for Service Plan or for Reseller. This depends on where the limit is configured in each specific case. There are 3 options: