Why is the 'useradd' command failing with 'useradd: invalid user name' error message in Red Hat Enterprise Linux?

Solution Unverified - Updated -

Issue

  • Not able to add new local user who has '@' sign as part of username. It throws error as "invalid user name". For example username as:
]$ sudo useradd testuser@example.com
useradd: invalid user name 'testuser@example.com'

Environment

  • Red Hat Enterprise Linux 5.x
  • Red Hat Enterprise Linux 6.x
  • Red Hat Enterprise Linux 7.x

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