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This issue has now been resolved and any rejected emails can be sent again now. We apologise for any inconvenience caused .
We are currently seeing an increase in false positive issues due to a misclassification of emails with one of our scanning engines, we are currently working to resolve this issue as soon as possible. For any urgent emails you can add a temporary whitelist in the SMX email admin portal. Further updates to this issue will given as soon as they are known.
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