How to Limit the Number of Outgoing Email Messages in Plesk

• Log into Plesk Panel
  Go to your Plesk login page and enter your username and password.
  
  

• Open Limit Outgoing Messages
  

  ◦ Select the domain you want to manage ,Inside the Mail section, click Limit Outgoing Messages.

  ◦ This option allows you to control how many emails can be sent per hour from the selected domain.
  
  
  

• Set the Outgoing Email Limit
  

   Choose one of the following options:

  ◦ Default (30 message per hour)

  ◦ Custom value for this domain and enter the number of messages per hour

  ◦ Unlimited (not recommended unless necessary)
  
  After selecting the desired option, click OK or Apply to save changes.