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It appears there are two sets of requirements. One for senders (i.e. domains) that send 5,000 or less messages a day, and one for senders that send over 5,000 messages a day. The requirements for all senders appears to be the same (or very similar) to what we have been experiencing for the last 18 months ...

Hello everyone, Over the last several weeks we have seen the number of email messages being rejected because of a failed DMARC check increase substantially. What we had been seeing before this started was that messages that failed to authenticate (i.e. failed SPF, DKIM, and/or DMARC) were treated as ...