One GCC dev told me once that no app should ever crash no matter what is the 
input. ...and while most crashes are harmless zero-pointer dereferences some 
crashes are exploitable => if there is any chance you can send the devs the 
mail that caused the crash, perhaps after saving it as .eml an compressing it 
into a .zip file the devs will most probably be grateful: Most crashes are easy 
to fix once a dev can reproduce them because the debugger will most probably be 
able to tell which line the crash was caused by.

Unfortunately, as Schneier says security is a moving goal: every day bugs are 
fixed and every day weird contents is created that triggers bugs and even 
simple things that used be near-plain text (like mails and websites) get more 
complicated every day which means each app will be "crappy" regarding to your 
definition from time to time. The cause for the crash might even lie completely 
outside if the app in a library the phone happens to provide. In this time it 
cannot be found in k9's code nor using any different phone than a S9. I am not 
a k9 dev. But with wxMaxima, the program I support I have learnt to dread this 
kind of bug.

On 7 January 2020 18:31:08 CET, Eric Katz <[email protected]> wrote:
>Thanks. In my case I can't fwd to myself. Apparently the server spam filter
>blocks its although the original sender manages to get it thru.
>In any event, email composition content should not crash an email app.
>Crappy coding. Any suggestions for a good, reliable email app that works?
>
>
>On Tue, Jan 7, 2020, 12:26 PM George Scott Hollingsworth <
>[email protected] wrote:
>
>> That happens to me on occasion with some spam. It happens all the time
>> with emails from discover.com. They format their multipart boundary
>> string with either dash or equal. I can forward it to myself and it doesn't
>> crash k-9. I have examined the source of the discover email.
>>
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Diese Nachricht wurde von meinem Android-Gerät mit K-9 Mail gesendet.

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