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This happens once a week when the weekly newsletter goes out. About 12 emails to 12 members bounce with this error and come up as a server error. I only have about 250 members at the moment, so won't be exceeding the email quota (I think). I noticed the IP address is an IPV6 one. Any ideas? I'm wondering if they're all gmail addresses and google doesn't like something. I have DMarc, SPF and DKIM set up via cloudflare.
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