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Yahoo problems? Could be SOA record issues in DNS


Are you seeing this bounce message when trying to send mail to Yahoo subscribers?

451 Message temporarily deferred due to unresolvable RFC.5321 from domain; see https://postmaster.yahooinc.com/error-codes

And you've checked and confirmed that your sending domain seems to resolve for you, so you're wondering, what the heck is going on and what do I do about it? If so, Steve Atkins has got you covered. Over on the Word to the Wise blog, he explains how Yahoo is looking for an SOA record (Start of Authority) in DNS and depending on how your DNS and delegation are configured, you could be misconfigured in a way that most don't notice, but would fail this check.

Click on over to Word to the Wise to learn more. Thank you, Steve, for clearing this up! It's a tricky one.

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