Same issue here.
Usually our gmail account is accessed from desktop device.
Occasionally from mobile Android based device using K-9. Last time we did 
it using K-9 the Google system sent to us the warning mail as addressed in 
this discussion.
The sender is [email protected]
The subject is Sign-in attempt prevented

Sign-in attempt prevented 
Hi K,
Someone just tried to sign in to your Google Account [email protected] 
from an app that doesn't meet modern security standards.
Details:
Tuesday, September 15, 2015 3:16 PM (blablabla Summer Time)
blablabla*
We strongly recommend that you use a secure app, like Gmail, to access your 
account. All apps made by Google meet these security standards. Using a 
less secure app, on the other hand, could leave your account vulnerable. 
Learn more.

Google stopped this sign-in attempt, but you should review your recently 
used devices:

REVIEW YOUR DEVICES NOW
Best,
The Google Accounts team
This email can't receive replies. For more information, visit the Google 
Accounts Help Center.
*The location is approximate and determined by the IP address it was coming 
from.
You received this mandatory email service announcement to update you about 
important changes to your Google product or account.
© 2015 Google Inc., 1600 Amphitheatre Parkway, Mountain View, CA 94043, USA

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