@ChristianEhrhardt - Yes, it is sure that dovecot panics for e-mails of this 
size.
We encountered the issue with e-mails which are a few kilobytes smaller, but 
the exact threshold
might vary (e.g. depending on 'server speed').
All in all 60K seems to be the right magnitude.
I would also like to mention that the bug occurs independent of the executed 
filter.
A simple filter that would read the mail from stdin and pass it to stdout 
without any modification would be sufficient to trigger the described behavior.

We could verify a fix / a newer version against our setup in Xenial and
Yakkety.

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https://bugs.launchpad.net/bugs/1633220

Title:
  Dovecot panics when sieve filter outputs much data

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