SMTP Error Could not authenticate in PHPMailer

Question

I m using PHPMailer in a Simple Script For Send Email s Through Gmail  and I m getting an  Unknown Error   At least for me        SMTP Error  Could not authenticate    Error  SMTP Error  Could not   authenticate       SMTP server error  5 7 1 Username and   Password not accepted  Learn more at   535 5 7 1   http   mail google com support bin answer py answer 14257   p38sm2467302ybk 16   I ve read about Configure OpenSSL For SSL TLS Connections  and I did it  Apache And PHP Are properly-Configured  With OpenSSL extension Running in PHP and mod ssl running in Apache 2 2 16    This is The PHP Script     lt  php   require once   PHPMailer class phpmailer php       Correo   new PHPMailer       Correo- gt IsSMTP       Correo- gt SMTPAuth   true     Correo- gt SMTPSecure    tls      Correo- gt Host    smtp gmail com      Correo- gt Port   587     Correo- gt UserName    foo gmail com      Correo- gt Password    gmailpassword      Correo- gt SetFrom  foo gmail com   De Yo       Correo- gt FromName    From      Correo- gt AddAddress  bar hotmail com       Correo- gt Subject    Prueba con PHPMailer      Correo- gt Body     lt H3 gt Bienvenido  Esto Funciona  lt  H3 gt       Correo- gt IsHTML  true     if    Correo- gt Send            echo  Error   Correo- gt ErrorInfo         else         echo  Message Sent          gt    The Username and Password are OK  And I tried in Thunderbird  without any problem   I ve also Used SSL Authentication and Port 465  getting the same Error

User · Answer

I experienced the same error when configuring the WP-Mail-SMTP plugin in Wordpress.

The problem would persist even when I have 'triple checked' the settings and login credentials, and am able to log in manually using a browser.

There's a list of steps you can take to fix this.

Create a new password for the Gmail account you want to use
Enable less secure apps in Google Security settings
Use the Display Unlock Captcha page to give your app or website permission to sign in to Gmail. Click Continue or follow the instructions.
Sign in using the app or website. The smtp settings that work for me are 1) SMTP Host: smtp.gmail.com 2) SMTP port: 587 3) Encryption: TLS 4) Authentication: SMTP authentication 5) Username: [email protected] 6) Password: examplesecret

User · Answer

I had the same issue and did all the tips with no luck  Finally when I changed password to something different  for some reason it worked   the initial password or the new one did not have any special characters

User · Answer

I received the same error and in mycase it was the password  My password has special characters for and if you supply the password without escaping the special characters the error will continue to show  E g  mail- gt Password       por ch3    is valid but will not work using the code above   The solution should be as follows   mail- gt Password      por  ch3   Note the Backslash I placed before the dollar character within my password  That should work if you have a password using special characters

User · Answer

I had the same issue which was fixed following the instructions below  Test enabling    Access for less secure apps     which just means the client app doesn   t use OAuth 2 0 - https   oauth net 2   for the account you are trying to access   It s found in the account settings on the Security tab  Account permissions  not available to accounts with 2-step verification enabled    https   support google com accounts answer 6010255 hl en  original link for the answer  https   support google com mail thread 5621336 msgid 6292199

User · Answer

I received this error because of percentage signs in the password

User · Answer

I had the same issue and did all the tips including Gmail setting  e g  less secure apps access  with no luck  But finally when I changed password to something different  for some reason it worked  FYI  the initial password did not have any special characters

User · Answer

It was the selinux issue  I just updated the below given part in   etc selinux config file  SELINUX permissive            it was SELINUX enforcing  before   then just reboot the system by giving  reboot Now the mail goes without any hassle  Configuration  From Email Address    noreply yourdomain com  From Name    your domain name  SMTP Host     smtp gmail com Type of Encryption   SSL SMTP Port   465 SMTP Authentication    YES Username    your mail id  Password    your password

User · Answer

There is no issue with your code   Follow below two simple steps to send emails from phpmailer          You have to disable 2-step verification setting for google account if    you have enabled        Turn ON allow access to less secure app

User · Answer

I had the same problem with authentication  The fix was to set up 2-step verification and create an application specific password for the device   error messages for blocking the device will appear in your account settings-  Notifications and alerts  if you problem is the same with mine

User · Answer

If you still face error in sending email  with the same error message  Try this    mail- gt SMTPSecure    tls    mail- gt Host    smtp gmail com     just Before the line    send    mail- gt Send      or in other sense  before calling the Send   Function   Tested and Working

User · Answer

For me I had a special characters in my password field  and I put it like  mail- Password     por ch3  which work for gmail smpt server but not for other  so I just changed double quotes to single quotes and it works for me   mail- Password     por ch3

User · Answer

this is GMail issue   read this Google Help  https   support google com mail answer 14257 p client login amp rd 1    Open your web browser and sign in to Gmail at http   mail google com mail  If you see a word verification request  type the letters in the distorted picture and finish signing in  Close your browser and try accessing your messages in your email client again  If you re still having problems  visit http   www google com accounts DisplayUnlockCaptcha and sign in with your Gmail username and password  If necessary  enter the letters in the distorted picture  Click Continue  Restart your mail client and try accessing messages in your email client again

User · Answer

I encountered this problem  To get it working  I had to go to myaccount google com - gt   quot Sign-in  amp  security quot  - gt   quot Apps with account access quot   and turn  quot Allow less secure apps quot  to  quot ON quot   near the bottom of the page   Alternatively you can follow this direct link to these settings

User · Answer

my solution is   change gmail password on gmail  quot Manage your google Account quot   gt  Security  gt  Turn on 3rd party app Access This the new step that i discover by UnlockingCaptcha that told in this site  the exact site is https   accounts google com b 0 DisplayUnlockCaptcha  but maybe you want to read the former site first   That all  hope it works for you

User · Answer

Try this instead     Correo- Username    foo gmail com    I tested it and its working perfectly without no other change

User · Answer

The other post is correct to resolve the issue but doesn t address how to do it if the 2-step-verification is turned on  The option to allow the less secure apps is NOT available then   Here is an answer to how to do it    a  Go to the URL of  https   myaccount google com   and click  Sing-in and security   b  Click on the app password        You will reach a page like this      c  Create name of your app and generate a password for the respective app     d  Use that password acquired here inside the app    This should resolve the issue

User · Answer

first go to https   myaccount google com Select Security tab Scroll down and select  Less secure app access  Turn on access   This will solve my    SMTP Error  Could not authenticate    in PHPMailer error

User · Answer

SMTP Error  could not authenticate I had the same problem  The following troubleshooting steps helped me    I turned off two-factor authentication in my gmail account  I allowed less secure apps to access my gmail account  To get it working  I had to go to myaccount google com -  Sign-in  amp  security -  Apps with account access  and turn Allow less secure apps to ON  near the bottom of the page   At this step  when I tried to register a user  I would get the same error  Google would sent me a warning message that someone has my password and the login was blocked  Gmail will then provide you with options  You either click whether the activity was yours or not yours  Click the option that the activity was yours  Try registration again  It should now work

[php] "SMTP Error: Could not authenticate" in PHPMailer

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