There are two options for adding quarantine users automatically:
On the Enterprise or Reseller plans you can setup quarantine users in bulk via Active Directory or LDAP, as mentioned in this article:
Using Active Directory (Exchange) or LDAP to set up valid email addresses
On the Enterprise or Reseller plans you can setup quarantine users in bulk via Azure Active Directory, as mentioned in this article:
Using Azure Active Directory to set up valid email addresses
Quarantine users can be added in bulk through the SpamHero API.
If adding quarantine users automatically is not an option, the following method can be helpful for getting quarantine users added to the system in bulk:
Open the Settings > Quarantine users page in the white label control panel. First, click add, and then check the Add quarantine users in bulk radio button. You can then add all the quarantine users you need with a comma separated list.
If you'd like to make a quarantine user for every email recipient, you can first download a CSV for your email recipients by going to the Settings > Email recipients page, and clicking on the Export option at the top of the grid:
Quarantine reports can be set up for each user automatically. See:
Can quarantine reports be set up automatically for new and existing users?
We are considering adding a feature to allow for a CSV file import that would allow for more options for adding quarantine users. You can vote for the feature in our Community Suggestion Box by going here:
https://www.spamhero.com/cp/community-suggestion-box?_row=4059
(This link will prompt you to login)
This would be similar to using a comma separated list, but allow for setting additional options, such as configuring the quarantine reports.