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Urgent help! Server returned an error: "535-5.7.8 Username and Password not accepted
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Hi,

A few days ago, all our additional "send email as" emails stopped working for no apparent reasons.  We not always get this error:  

Authentication failed. Please check your username/password and less secure apps access [...]
Server returned an error: "535-5.7.8 Username and Password not accepted. Learn more at 535 5.7.8 https://support.google.com/mail/?p=BadCredentials m12sm3738485ljc.81 - gsmtp , code: 535"

I tried enabling the ""Les secured app" feature, and it does not work either.  I do not understand.  I am logged in my gmail account, so my credentials are correct, otherwise I could not even go in the gmail settings.  This was working fine before, so what could have caused this? I have the same issue when using gmail on my Pixel 2 or from a mac, no matter waht.

Any help will be greatly appreciated.

Thanks.
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AMA on Gmail and Google Accounts.
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Have you referred to the details included here: “Password incorrect” error?
 
It could be possible that you may require to re-verify your client/device to Google besides allowing for less secure apps.
 
Please keep in mind that before clearing the CAPTCHA, be sure to sign out of all Google accounts you may be signed into and then sign in to the account you want to add to that device. If need be, first sign out of all accounts from the browser and then only sign in to the specific account. Also, be mindful of the fact that you'd need to go through the process within 10 minutes of clearing the CAPTCHA.
 
OR in case you have 2SV enabled, need to use application-specific passwords.
 
Please post an update. 
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Hello. We've started to receive the "535 5.7.8 Username and Password not accepted." error when trying to send emails from our Google accounts via SMTP. This article (https://support.google.com/mail/answer/7126229?p=BadCredentials&visit_id=637241835903528928-2035875531&rd=2#cantsignin) is advising to allow less secure apps to access the account. But when we follow the link we see the "Setting could not be read" on the screen. How do we change it? Thanks.

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Server returned error: "535-5.7.8 Username and Password not accepted. Learn more at 535 5.7.8 https://support.google.com/mail/?p=BadCredentials o190sm1936302pfb.178 - gsmtp , code: 535"

I am trying to add new mail accounts and keep getting this error. Have signed out and signed in a million times and turned on "allow less secure apps" and still nothing.  Help
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AMA on Gmail and Google Accounts.
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That issue where the "Allow Less Secure Apps" setting went missing should be fixed by now. Please let me know if you see is persist on your account.
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Same problem here... Not working today. I've found lately that I need to wait HOURS after updating my passwords. Even though my server recognizes the update within 15 minutes, gmail seems to take hours to see the updated pw.
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Hello all - I searched forever for something that would work and found so many threads like this without answers.  In April 2020, Google made some changes to the way security works on these "aliases".  I had to delete all of my "send as..." email addresses and re-add them with the instructions found here.  It fixed my issues.  
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لماذا ايمي ليستجيليستجيب م حسابي
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