When setting up a new phone for a Google Account K-9 mail you have to allow
"less secure apps" from a computer (AFAIK); but what else?
This is the error I repeatedly get from K-9 Mail on Android:
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All I know is what seems to have happened, so I simply document this, and
then ask others if they can help flesh out more about this issue, so that
others have an easier time setting up a Google Account to NOT use the
Google Gmail app (but to use the K-9 email app on Android instead):
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On the phone:
1. I obtained a new Moto G7 phone.
2. I allowed it to create a new Google Account during setup.
3. I used that Google Account to help populate some apps not on F-Droid.
4. Then I deleted the Google Account from the phone.
5. NOTE: I learned from past experience NOT to touch the GMail app [1]
6. So I tried the F-Droid "K-9" mail app, which would NOT log in.
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On the desktop:
7. I logged in fine from a desktop computer to the new Google Account.
8. Clicking on the security warning email said:
"Critical security alert"
"Sign-in attempt was blocked"
"Someone just used your password to try to sign in to your account
from a non-Google app. Google blocked them, but you should check
what happened. Review your account activity to make sure no one
else has access." [Check Activity]
9. [Check Activity]
"Less secure app blocked"
"Google blocked the app you were trying to use because it doesn't
meet our security standards. Some apps and devices use less secure
sign-in technology, which makes your account more vulnerable.
You can turn off access for these apps, which we recommend,
or turn on access if you want to use them despite the risks.
Google will automatically turn this setting OFF if it's not being used."
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https://support.google.com/accounts/answer/6010255>
"Less secure apps & your Google Account"
"If an app or site doesn┤ meet our security standards,
Google might block anyone who┬ trying to sign in to your account
from it. Less secure apps can make it easier for hackers to get in
to your account, so blocking sign-ins from these apps helps keep
your account safe."
Once you allow less secure apps, and confirm with the desktop Google signin
that, yes, you allowed it, then, supposedly you can log in from the phone
with K-9; but my K-9 still failed to make the connection with:
"Checking incoming server settings"
"Setup did not finish"
"Username or password incorrect"
Has this happened to you?
How did you get around it?
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[1] No matter what you have as settings, the Gmail app will "sync" stuff to
"the cloud" that you likely do NOT want synced (AFICT); AFAIK, you can't
prevent this syncing other than by never using the Google Gmail app.