Email Failure

I am using Gmail through my Outlook 2013 on my Windows 7 computer.  All of a sudden I cannot SEND emails.  New emails arrive just fine, but every outgoing email returns an "undeliverable" message - regardless of who I send it to.  When I include myself as a BCC it simply doesn't arrive.  I've tried running Norton Utilities and Malwarebytes scans and rebooting the computer, to no avail.  No new program has been installed since last  night when everything worked fine.  Please see the error message I get below - please help!

Email Error
Thanks,

Phil
philsimmonsAsked:
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dhoppelCommented:
Please double check your outbound SMTP settings for gmail. You should be using IMAP SSL for inbound and SMTP TLS for outbound (smtp.gmail.com on port 587 with SSL and authentication)
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philsimmonsAuthor Commented:
Turns out the "authentication" was unchecked.  Thanks for the prompt and accurate reply.
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