Occasional email forwarding errors

I set up email forwarding a few months ago and it works fine, normally there are just a few emails forwarded weekly (usually below 20), however it’s the 2nd time that an email wasn’t forwarded, in the dashboard I can see error counts spike for a day (more than 18 errors per hour) but in the logs i can only see status error and if I expand the entry SPF, DMARC and DKIM status is “none”.
The sender (per their statement) didn’t receive any mail about the failed delivery.
So my question is, how can I get more details about what went wrong and how can I prevent this from happening in the future.

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Same here. I see emails that are in “error” status that never got delivered to the client.
I’m assuming this is because the sender has no SPF/DKIM or DMARC but is there no option to override/ignore this?