Because it's not about setting it up, it's about not getting outgoing mail perceived as spam by someone. Borderline impossible without scale. Even doing everything correct is not enough.

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gerdesj 15 hours ago | parent [-]

and yet I manage to do it for multiple domains, for over 20 years in the UK.

	▲	Biganon 8 hours ago \| parent [-]
		Congratulations, your IP isn't considered smelly. Let me just change my IP entirely. Oh wait, that's tedious as fuck.