Lots of 400 errors with no further details about import-mailbox-to-gmail HOT 3 CLOSED

Hi Dave,

First, sorry to hear your experience wasn't smooth. I'm aware that there are issues with the data migration tool in the Admin console, particularly around reporting errors - they aren't always very helpful. The good news is that as a G Suite customer you can contact support (via the 'Support' icon in the Admin console) and get help with this. :)

Regarding the API error - my first guess would be a malformed message, but it's also possible it's an issue with the tool's parsing (it uses the Python mailbox library), or the API returning a vague error message (e.g. "Bad Request" instead of saying what's bad about it).

If you can, please create a text mbox file with just one of the affected messages and try to import it. If it succeeds, then this was probably some issue with the request rate. In this case, it's an issue with the API returning the wrong response, because the response should be a status 5xx/429 or a 403 with userRateLimitExceeded/rateLimitExceeded.

If it fails with the same error, and you don't see anything clearly wrong with the message in the mbox, I'd suggest you raise the HTTP logging level to 4 (add --httplib2debuglevel=4) so the full requests and responses are logged, and then contact G Suite support with the log so it can be investigated. You can also post it here but I assume you wouldn't want to post private emails on GitHub. :)

BTW, if you need to re-import some of the data, currently the script would just blindly re-import all of it, but Gmail will de-dupe the data, so although this would still take a lot of time, at least you wouldn't get duplicate messages.

I hope this helps - let me know in any case, so I can follow up internally.

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Side note: If you want, you can also give got-your-back import a try, although it would probably be affected by API issues the same way.

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Closing as there was no response.

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