Most Enchanter spells are alteration, including your mana hogs (haste, slow, charm etc.). While mez is conjuration, you're not generally mezzing enough to totally drain your mana and you always have the level 4 mez if you're having mana issues.
Anytime I see enchanters complain about mana issues, it's because of hasting a melee heavy group and charm breaks/recharming. Not mez.
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