Can it be that when I've authenticated my domain with proper SPF, DKIM and DMARC records on DNS, my deliverability dropped? I've been sending emails for about three years now (without domain authentication) and got about 25% open rates. After authentication it dropped and now (even after cleaning my recent inactive subscribers) it's good when it breaks 20%. I've read that authentication should IMPROVE deliverability, not DECREASE it. What might be the reason?

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