The white King, heartbroken and disillusioned with his future prospects, lost in a dreary mist of drug-fuelled degeneracy, stuck in the throes of a severe midlife crisis, summons his best friend, his confidant, his ride or die BRO to cheer him up. Ke8 to e1.

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If you want free options, I often use MailEnable and hMailServer in lab environments. Also a free Azure developer trial includes some M365 licenses, and it pretty much always auto-renews every 90 days (I've had a few tenants going for YEARS now)