I believe that your issue is the fourth bullet point in on the support page they link to:

-- Your mail app might not support the latest security standards. Learn how to allow less secure apps access to your account.

If you aren't using OAuth 2.0 (which you aren't in your context):

https://developers.google.com/gmail/oauth_overview?hl=en

you need to set your gmail account to accept connections from "less secure apps".

https://support.google.com/accounts/answer/6010255?hl=en

Thanks Richard,

I actually logged into my gmail account and found the setting for Allow less secure apps and there was a checkbox there already.

How do I add Oath 2.0 to either smmtp or sendmail. I dont care which.

Thanks,

Jerry