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Does Sendy support a hardware dongle for authentication? If so, any suggestions?
Sendy does not support ‘hardware dongles’ for 2 Factor Authentication. You can use Google Authenticator for iOS or Android:
iOS → https://itunes.apple.com/app/google-authenticator/id388497605?mt=8
Android → https://play.google.com/store/apps/details?id=com.google.android.apps.authenticator2