Evolution 2.22.3 will give up rendering after trying for some time and
display a warning: "Evolution cannot render this email as it is too
large to handle. You can view it unformatted or with an external text
editor."

You can create a simple test file with
   perl -e 'print "\n"x1000000' > /tmp/evil.txt

The upstream bug is about evolution honoring "Content-Disposition:
inline" for attachments.

There are several issues here:
* there is no option to ignore content-disposition:inline to prevent harmful 
attachments from displaying automatically (#229013)
* rendering texts uses too much memory and cpu (1mb newlines => 50% ram)
* after displaying the warning evolution continues to consume memory and does 
not free it until program exits

-- 
evolution chokes when a large txt file is in attachment
https://bugs.launchpad.net/bugs/21178
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