Yesterday I accidentally emailed a salary breakdown for one employee to another employee in the same role. Our company email signature states that all information is confidential and for the addressee only, and when employee A wrote to me saying "I've just seen B's salary" I wrote back apologising and reminded him it was confidential.
Employee A has since written to his manager informing him that I showed him B's salary and asking for more money. I'd given his manager the heads up.
My question is, do I need to do anything else? Do I need to inform B of the error? Should any action be taken against A for using the information he knew he'd received in error, or against me for the mistake?
Very worried here, would appreciate any info.