I got such a disturbing warning too.
The reason is, they take the location of your internet provider!
Ursprüngliche Nachricht
Von: Luke A
Gesendet: 14. Mai 2019 03:02:13 MESZ
An: K-9 Mail
Betreff: [k-9-mail] k-9 mail suspicious login attempt just days after adding
accounts
Thank you!
--
You received this message because you are subscribed to the Google Groups "K-9
Mail" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to k-9-mail+unsubscr...@googlegroups.com.
To view this discussion on the web visit
No, that is not normal. Definitely investigate that.
However, if you are using Gmail (as your email provider) and you disabled "Less
Secure App Access" then you will periodicly receive emails about abnormal
activities which is actually normal (just K9 fetching your emails).
Re-enabling Secure