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"Mail server responded: Username and password not accepted."

  • 2 replies
  • 1 has this problem
  • Last reply by JC

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The noted error message appeared suddenly on my gmail account. I have confirmed that gmail is working properly by accessing it via the web. I have confirmed that my username and password are the same as worked in the immediate past. I have confirmed that account settings have not changed and are reportedly accurate. T-bird seems to work OK with non-gmail email accounts. I have browsed similar complaints on these (and similar) boards (for way too long a time), and they have not been helpful. Unless I'm missing something, the responses are either (a) yes it's a problem and no one has come up with a solution, or (b) instructions that either don't work or don't track any of the screens I can see. I don't know what to do. Mac High Sierra OS.

Is anyone willing/able to start fresh on this for me?

Modified by JC

All Replies (2)

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I don't know which source you used as reference for account settings, because the POP server name you're using is different from what Google provides here Change them to match, and set Authentication Method to OAuth2, then open Thunderbird's password manager and delete the old entry.


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Thank you, but I don't understand part of this and the part I did understand solved only some of the problem.

I have changed the POP server name(s) to The port is 995 Outgoing mail is I don't show "requires SSL." I show "security settings connection security" and the choices are "none," "start TTLS" or "ssl/ttls." This last one ("ssl/ttls") is selected and was selected when the email worked OK previously. I don't show "requires authentication." I don't show "Port for TLS/STARTTLS"

I don't know what "old entry" to delete from the password manager.

Now when I try to send an email using the gmail I get this error message: An error occurred while sending mail: The mail server sent an incorrect greeting: +OK Gpop ready for requests from 2604:6000:f3c8:c000:594:7d60:1200:f653 c12mb42999303qkb.

When I tried to receive emails I got a screen telling me to sign in with my google account. I did so and now seem to be receiving emails.


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