gmail – not sending to non gmail accounts

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Hi,
I have had this plug working for some months – but now it’s not sending to non gmail type accounts.
We have a dedicated Google Project and removed and re-added the Client Connection details.

But it’s not sending to external (non google/gmail) email accounts – even though it comes up in the Sent Folder in the email client. Sending directly from the client to external users works.

Any tips?
Cheers