On the settings page the Number Rule can be indicated the number to that maximally to receiving Emails. This number must lie between 1 and 120. The border to the rule almost run off is here with 5. That means: if still 5 or fewer Emails will receive can appear the Icon to the certain rule on the summary page in yellow color, a reference this rule in the near future run off.
The Number Rule a number of Emails defines to be received is. If the defined number was received from Emails, then all further Emails sent to this address are rejected.