Antitoxin component of a type II toxin-antitoxin (TA) system. Neutralizes the toxic effect of cognate zeta toxin. Part of a postsegregational killing (PSK) system involved in the killing of plasmid-free cells. Continuous synthesis of the epsilon antitoxin is required to counteract the zeta toxin. In the presence of the zeta toxin, forms an inactive PezA(2)PezT(2) heterotetramer. The heterotetramer is still able to bind the zeta toxin substrate UNAG. Has a short half-life in vivo. Belongs to the epsilon antitoxin family.