Hi Philip,

Thanks for all that feedback.

As the main issue is the attachments, and these seem to be stored separately in 
their own folder per account, why not possibly consider:–

1) for security - keeping email settings and the core email messages stored as 
they are presently - and probably unmovable, but

2) after giving a premptive advisory  security warning, allow users above 
KitKat to choose where their email *attachments* will be stored, so that a 
"removable" sdcard (which is left in any way by most people) may be used for 
the attachment part.

Above KitKat apps can write to sdcard1 (etc) even if removable.

Should the previously selected "removable" sdcard not be present at K9's 
launch, inform and prompt User to reselect attachment storage area, or insert 
the sdcard again before proceeding.

The attachments' names are already pretty well obstrificated any way (so 
without access to, and the interlinking of the K9 database(s) - are pretty safe 
from interlopers?), and any way when "opened" or particularly "saved" by the 
User - attachments are going to be exposed openly to their broader file system 
as it is.

Already I sucessfully ask K9 to "save" attachments to my sdcard1. I just need 
it to "store" them there in the first place :-)

Even as presently stored, ES FileExolorer may access and manipulate the 
attachment folders and contents any way, and no doubt a gremlin app tricking a 
User to bogus interaction can too. But the nice obstrification you've already 
provided on the attachment names makes them pretty random in meaning without 
access to the K9 databases.

For the sake of avoiding a space related system melt down - really hoping for 
an early easily implemented solution! :-)

Kind regards,
Paul

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