Error decompressing data

[Bron Gondwana]

On Mon, Jul 2, 2012, at 03:26 PM, steffo76 at gmx.de wrote:
> Hi list,
> 
> I am having trouble with Apple Mail on iPhone and cyrus imapd. In telemetry logging I see the following:
> 
> 3 OK Completed^M
> <1341234999<4 COMPRESS DEFLATE^M
> >1341234999>4 OK DEFLATE active^M
> >1341235140>* BYE Error decompressing data^M
> 
> In my maillog I can see the following
> 
> Jul  2 15:24:06 server imap[32304]: zlib inflate error: -3 invalid distance too far back
> 
> This is cyrus imapd 2.4.12. Any hints how to resolve this ?

Workaround:

suppress_capabilities: COMPRESS=DEFLATE

Is this every time, or just sometimes?  It looks like there's a bug in the zlib
usage somewhere along the line.

Bron ( or a bogus virus scanner fiddling the data stream )
-- 
  Bron Gondwana
  brong at fastmail.fm