Thanks for the info, Mark. It’s good to have confirmation that we’re not the only ones experiencing this.
Best regards, Fernando. On Wed, May 14, 2025 at 11:17 AM Mark Alley via mailop <[email protected]> wrote: > It's been mentioned several times here already, but Microsoft has had > known issues with DNS timeouts related to DKIM verification for a very long > time now. You're likely just now experiencing it more directly with their > recent policy changes. > > Over 99% of ${dayjobs} DKIM verification failures (numbering in the > millions) are from specifically OLC, outstripping all other DMARC reporting > receivers combined. Even upping TTL has almost no effect unfortunately. > > - Mark Alley > On 5/14/2025 8:45 AM, Fernando MM via mailop wrote: > > Hi everyone, > > Is anyone else experiencing intermittent DKIM failures when sending emails > to Outlook.com? This started on May 5th. > > If I resend the same message, it’s successfully delivered. By “same > message”, I mean the exact same content, headers, Message-ID, DKIM > signature, etc. Essentially copy/pasting the original message without any > modifications. > > Even other messages sent in the same SMTP connection and using the same > sender/DKIM key are accepted. > > The error message I receive is: > > ``` > 550 5.7.515 Access denied, sending domain REDACTED-FOR-PRIVACY.COM > doesn't meet the required authentication level. The sender's domain in the > 5322.From address doesn't meet the authentication requirements defined for > the sender. To learn how to fix this see: > https://go.microsoft.com/fwlink/p/?linkid=2319303. Spf= Pass, Dkim= Fail, > DMARC= Pass [SA0PR11MB4544.namprd11.prod.outlook.com > 2025-05-13T15:54:59.356Z 08DD91CC42BDD986] > ``` > > DKIM is correctly configured. I’ve verified it using multiple tools (e.g., > https://aboutmy.email/, opendkim-testmsg, etc.), and we have zero issues > with other providers. DMARC is set as "v=DMARC1; p=none;". > > I’ve opened a support ticket, but the responses so far have been generic > and not directly related to the intermittent nature of the issue. > > Anyone else seeing something similar? > > Best regards, > Fernando. > > _______________________________________________ > mailop mailing [email protected]https://list.mailop.org/listinfo/mailop > > _______________________________________________ > mailop mailing list > [email protected] > https://list.mailop.org/listinfo/mailop >
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