Some 65 employees at the Driver and Vehicle Licensing Agency (DVLA) in Swansea are facing disciplinary action for circulating pornographic e-mails.
The workers have been charged with gross misconduct after an investigation found they had been distributing lewd and inappropriate material while at work.
More than 100 DVLA staff were disciplined in June for e-mailing pornographic images following a three-month investigation. The agency also sacked 14 staff after the inquiry.
Some staff have attempted to challenge the decision but have been unsuccessful so far, icWales reports.
A DVLA spokeswoman said: "As a result of DVLA's continuing investigation into the inappropriate use of its e-mail facility, 65 employees have been charged with gross misconduct."