Hi, starting from 02/2024 Gmail will require authenticated email for senders who send 5,000 or more messages a day to Gmail accounts. However, authenticated email requirements seems to have started today, in the past days those email messages where temporary rejected, starting from today I have the following error message:
550-5.7.26 This mail has been blocked because the sender is unauthenticated.5.7.26 Gmail requires all senders to authenticate with either SPF or DKIM.5.7.26 5.7.26 Authentication results:5.7.26 DKIM = did not pass5.7.26 SPF [domain.tld] with ip: [1.2.3.4] = did not pass5.7.26 5.7.26 To mitigate this issue, please visit Gmail's authentication guide5.7.26 for instructions on setting up authentication:5.7.26 https://support.google.com/mail/answer/81126#authentication z20-20020a05600c0a1400b004068c7a951csi7296094wmp.167 - gsmtp I have solved the issue on my side, just a warning for anyone else that will hit this error message. Giovanni
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