i came back from a meeting at 3pm. 3:07 - guy in the cube next to me said "wtf, my email to you just bounced back?" 3:09 someone came with a box to escort me

i came back from a meeting at 3pm. 3:07 - guy in the cube next to me said "wtf, my email to you just bounced back?" 3:09 someone came with a box to escort me out of the building. 3:19 main client calls me on my mobile asking why emails to me are bouncing. i was the only contact and worker on the client's project. HR person wanted me out so bad they just cut me off without transitioning the client services to someone else.