Generally Gmail error 8770 occurs when the message limit exceed the limitation more than 25mb. And the message failed to send at recipient mail address. But it's not too difficult to resolve the error just Contact To Gmail Team and fix it as soon as possible.
Follow some steps to get rid out from the error:
- Delete oversize message
- Attach file with less than 25mb
For more information you may also contact to Gmail Online Help Team. Technical experts are always available to help you.
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