Sendmail authentication error with gmail

Here is my code:

myaddress = '[e-mail]';
mypassword = 'example';
setpref('Internet','E_mail',myaddress);
setpref('Internet','SMTP_Server','smtp.gmail.com');
setpref('Internet','SMTP_Username',myaddress);
setpref('Internet','SMTP_Password',mypassword);
props = java.lang.System.getProperties;
props.setProperty('mail.smtp.auth','true');
props.setProperty('mail.smtp.socketFactory.class', ...
    'javax.net.ssl.SSLSocketFactory');
props.setProperty('mail.smtp.socketFactory.port','465');
sendmail([e-mail],'email subject test',...
    'this email is a test','D:\testimagetosend.tif')

And here is the error message: Error using sendmail (line 171) Authentication failed.

From everything else I have read, the preferences and properties required for gmail are all taken care of, but still getting the error.

[Alberto]

Hi Erin,

Your code seems to be right, it is the same as mine. Maybe it is due to firewalls or from an internal settings of your OS. In my case, my code for sending emails from gmail always worked.. up to now. Now I use Windows 8 and it does not work any longer. If this is your case, then we have the same problem :(

[Alberto]

Ok, I have tried to run it on my previous machine, under WinXP, where the code always worked fine and.. now it doesn't work on WinXP neither. So, the point is then that gmail has changed its settings. At least in my case, it does not seem to be a matter of the firewalls or the OS. Something has changed on gmail in the last eight months (the last time I had to use the function).

I hope it helps you a little bit. Regards

[Bruno Rango]

Hi!

I've also gotten the same authentication error. To fix it, allow Gmail to get acces from less secure apps. To do this, click turn on in the following link:

https://www.google.com/settings/security/lesssecureapps?rfn=27&rfnc=1&asae=2&anexp=lbe-R1_C

It worked for me, so I hope it helps.

Kind regards.

Bruno R

[Manikandan Prabakaran]

Mr.Bruno's solution works fine. Thanks a lot sir.

[machhindra bhamare]

thanks

Answer 1

[Walter Roberson]

Within the last 8 months, Google turned off default support for an older less-secure authentication. You can re-enable it on your account... for now.

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

[Ella]

Awesome Thank you for sharing the solution

[Irene arnaldo]

I am still having problems with authentication failed!!

A) I have disabled 2 step verification, turned on 'less secure apps' and introduce used my normal password on matlab code: didnt work.

B) I also tried getting the app password but matlab doesn´t recognize it (Do you need to verify it somehow thrugh matlab???).

[Shae Morgan]

I'd like to add that if your use seems suspicious to google, it'll still fail the authentication attempt as suspicious activity.

Not sure how to work around this.

[Tom]

As of March 2022 Google has disabled this completely :/

Answer 2

[Pankaj]

For some service providers the extension ' @gmail.com' in myaddress may cause authentication error. Simply use userID.