Google blocking SMTP email in shinyapps.io

Google are blocking SMTP email in shinyapps.io. I tried with multiple gmail addresses but same error. Is there any other way to send emails in shinyapps.io? I am using blastula package.

Sign-in attempt was blocked

I tried both the following methods to unblock but could not success.

https://accounts.google.com/b/0/DisplayUnlockCaptcha
https://myaccount.google.com/lesssecureapps

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