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E-mail client with a customized notification about specific mails

In terms of K9 - I can't even sign up on my gmail.
It's been a while since I used K9, but it is possible to sign in to GMail. You'll need to set an "application password" because it doesn't support GMail's current default initialisation/authentication. In fact I'm sure the error message you got will have told you that it would need an application-specific password. Go into you Google account settings, you'll find "App Passwords" in there under "Security" and can generate a new one there. Then use that in K9 for the email account password.
 
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