You can define the mailbox storage quota on any mail account via the webmail interface or the hosting control panel interface.
We do not limit you by pre-defining mailbox sizes. When a pre-defined limit is set on mailbox storage, you cannot actually use the most of it, as most storage in most mailbox is left unused. We understand that while some mailboxes may only need 1 GB storage to store emails, some requires as much as 10 GB, or more, but never the same.
This is why we allow you to customize mailbox size and set storage quota for your mailboxes as much or as little as you like. We also do not limit you on how many mailboxes you can have. Create as many as you like!