It is not possible to manage the default mailbox size via Plesk user interface in Web Admin edition, because the main purpose of the license is to keep everything unlimited excepting the number of domains.
The only way to manage it is through command-line with administrator privileges.
Note: if direct SSH/RDP access to the server is not possible, contact server administrator for further assistance.
Examples (both for Linux and Windows):
-
Set default quota to 100M:
# plesk bin subscription_settings --update example.com -mbox_quota 100M
-
Set the default mailbox size to the default value (Unlimited):
Note: default value for subscription is inherited from its service plan
# plesk bin subscription_settings --update example.com -mbox_quota -1
- To change the limit for a specific mailbox, use plesk bin mail utility (or from the User Interface at Mail > [email protected]):
# plesk bin mail --update [email protected] -mbox_quota 50M
