If you go to Extras > Settings > From Addresses and More in the detailed view, a maximum delivery speed can be set for the sender, in order to control the traffic for the target page of a mailing, for example. In addition, the redirect domain of the sender can be viewed here. The limitation of the delivery speed works on an email level. If multiple emails are sent with the same sender, the amount of emails per hour set here will not be sent. In this case, the value must be multiplied by the number of emails sent at the same time.