How do I fix a “550 5.7.26 Unauthenticated Email” error on Gmail?
The 550 unauthenticated email error is a hard bounce triggered when your sending domain completely lacks SPF or DKIM keys, or has a DMARC policy set to reject unauthorized mail.
“This one’s almost always a sending domain with no SPF or DKIM keys at all, or a DMARC policy set to reject outright. I’ll get the records in place within 24 hours for $99.”
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