Delete mail configuration
1. Navigate to mail configuration from your reseller administration page: (https://www.yourdomain.com/reseller)
2. Click on My Account (cogwheel icon), then on Mail Config.
3. Select the mail configuration you want to delete.
4. Click on "DELETE" in the top-right corner of the configuration popup.
5. Click yes on the warning popup if you are sure that you want to delete it.