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I've had mail sent via my own server rejected by gmail because of a missing Message-ID header. The 550 reject message was the standard "Unsolicited Mail detecte
by _cbdev 11y ago
I've had mail sent via my own server rejected by gmail because of a missing Message-ID header. The 550 reject message was the standard "Unsolicited Mail detected" text, the same mail was accepted without causing any fuzz once the Message-ID was added.