I recently noticed that, as is documented in  the wiki 
"https://github.com/k9mail/k-9/wiki/Intents";, I can program an app that can 
read lots of information about received emails. Just with a broadcast 
receiver for intent "com.fsck.k9.intent.action.EMAIL_RECEIVED" and with no 
extra permissions or K9 configuration changes, I seem to be able to 
intercept new mails from my testing app.

I also noticed that there exists customized permissions like "
com.fsck.k9.permission.READ_MESSAGES" but I seem to be able to read emails 
even without this. I also noticed that third-party apps like EmailPopup can 
read emails wothout the this pemission as can be seen in its 
*AndroidManifest.xml 
(*https://github.com/baolongnt/EmailPopup/blob/master/AndroidManifest.xml) 
where this permission is commented but seems to require 
com.fsck.k9.permission.DELETE_MESSAGES 
to perform other tasks.

    ...
    <uses-permission android:name="android.permission.INTERNET"/>
    <!-- For testing only
    <uses-permission android:name="com.fsck.k9.permission.READ_MESSAGES"/>
    -->
    <uses-permission android:name="com.fsck.k9.permission.DELETE_MESSAGES"/>
    ...




In the wiki it is also suggested that emails content can be read, 
attachments can be downloaded and new mails can be composed in your name 
using intents. I am worried about any installed application bean able to 
sniff, unnoticed, all my emails by default. If this is the default 
behavior, can it be prevented? I even wouldn't mind to loose all 
third-party apps integration by configuration. Also some clarification 
would be great in the Wiki documentation to explain the usage of customized 
com.fsck.k9.permission.* 
permissions.

Thanks to developers for this great app,
best regards.

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