To help protect your account, Google will soon block apps that don’t comply with Google’s security policies. You can let the app developer (ben@foundry376.com) know that this app should stop using unsupported OAuth flows

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I cant read or use any gmail or gsuite account anymore.

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@superdejooo - This appears to be resolved in Mailspring 1.10.8-8ea2a61f. I have a regular Gmail and an 0365 Organization Account connected to my Mailspring instance.