Hello Zoho support team

The issue is as follows:

Step1: Created an account community@bisonenergy.net

Step2: Deleted this account.

Step3: Created the new group mail using the same mail address, but the data already exists.

            So I have to change the name to aucommunity@bisonenergy.net, it's successful.

Step4: I make sure the all users and groups, nothing community@bisonenergy.net

So I would like to know this reason, and how to solve this issue. Maybe the account deleted way is wrong?

Waiting for your response. 

Regards,

Louise.Peng