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When an employee is off of work for any reason, the employer may limit or restrict contact with work. If an employee is out sick, they are presumed not to be able to work, which is what they are saying when they say they are too sick to come to work. So the employer can limit or restrict the employee's access to work emails or even work until they are able to return to work. That is not discriminatory nor a violation of FMLA for the employer to tell an employee that if they are out sick and need to be away from work under sick leave or FMLA, that they cannot do any work and no law or court case rules that an employer cannot do so.