My web host upgraded to Ensim Pro 3.7.0-21. In the process, I lost a couple of email accounts. I was able to recreate all but one. It has a period in it and I get this failure message:
* User Management - Add User
* ( ERROR ):Failed to create user. Command failed with 'useradd: invalid user name 'something.something'
I asked my host about it and they said to skip the period. Yeah, well, everyone that I deal with on that account has me with a period.