This is what I use in Zabbix email action
Subject (problem):
{TRIGGER.SEVERITY}/{HOST.NAME}: {ITEM.NAME}
Subject (recovery):
OK/{HOST.NAME}: {ITEM.NAME}
Body (for both, problem & recovery):
{TRIGGER.STATUS}: {TRIGGER.NAME}
{ITEM.NAME}: item = {ITEM.KEY}, value = {ITEM.VALUE}
Server: {HOST.NAME}
Private IP: {HOST.CONN}
Date/Time: {DATE} - {TIME}
{ITEM.DESCRIPTION}
{TRIGGER.DESCRIPTION}
Original event ID: {EVENT.ID}