Do you not have SPF records for your HELO/EHLO FQDNs? It appears the A record the PTR of that IP address resolved to " mail-108-mta34.mxroute.com" and it does not have an SPF record.
You should have a SPF record for each of your MTA hostnames that authorizes the IP and/or A record of said hostnames. That may fix the problem. - Mark Alley On Mon, May 27, 2024, 6:15 PM Jarland Donnell via mailop <mailop@mailop.org> wrote: > 421-4.7.26 Your email has been rate limited because it is > unauthenticated. Gmail requires all senders to authenticate with either > SPF or DKIM. Authentication results: DKIM = did not pass SPF [] with ip: > [136.175.108.34] = did not pass For instructions on setting up > authentication, go to > https://support.google.com/mail/answer/81126#authentication > 5614622812f47-3d1b370fc69si2809030b6e.141 - gsmtp > > Bounces coming from blank envelope senders are being held to SPF/DKIM > authentication, which of course fails. Been seeing this a lot lately. > Should we just not send bounce emails to Google anymore? > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://list.mailop.org/listinfo/mailop >
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