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Cannot integrate with gmail for sending emails

I am trying to connect to GMAIL SMTP server with no success.
I am getting this error :

Connection Failed
SMTP Authentication failed
javax.mail.AuthenticationFailedException: 535-5.7.8 Username and Password not accepted. Learn more at
535 5.7.8 h6sm19744247wiy.14 - gsmtp

I check 5 times my user and my password - its good,
even when trying to change to none security - nothing works...

Forum image

any idea ?

Thank you, Roy.
Hi Roy,

Thanks for the question. I just tested sending from my Gmail account and I can confirm that it does work. My settings matched yours.

Can you confirm that your Google account has 'Allow Less Secure Apps:' switched to 'ON' as outlined in the below article?:

Allowing Less Secure Apps Access to Your Account

You could also try navigating directly to the setting (provided you are signed into your account) using this URL:

If this doesn't work for you, could you double check the credentials you've entered in Yellowfin? The following article covers the password incorrect error:

Password Incorrect Error

Hopefully this information is helpful. Let us know how it goes. We look forward to hearing more.

Kind Regards,


Hey Dustin,

Nothing help, I enabled the "less secure" and tried it again with no success...
any more ideas ?

Thank you,