You can follow below steps:

- Login to Plesk.
- Click on “Mail settings” tab under “Websites & Domains”.

- Now select the email account for which you want to set the number of emails.
- After that click on “Limit outgoing Messages” in the toolbar.
- Here edit “limit on outgoing messages” textbox according to need.
- You can also edit “The maximum number of outgoing email messages” field.
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