Invalid Header - Non-encoded non-ASCII data (and not UTF-8)

[tlux]

On 2015-11-11 10:08, Egensperger, Fabrice wrote:
> Hello,
> 
> I'm using Kolab 3.4 with Multi-Domain Support.
> I'm not able to receive mail containing non-ASCII data in the mail 
> header.
> 
> See below error:
> 
> ********************************************
> 
> This nondelivery report was generated by the program amavisd-new at 
> host
> domain.net. Our internal reference code for your message is ...
> 
> INVALID HEADER
> 
>   Non-encoded non-ASCII data (and not UTF-8) (char E9 hex): Subject:
> Secr\x{E9}tariat
> 
> ********************************************
> 
> Does someone already had this issue?
> Is there a way to allow utf-8 in mail headers?
> 
> Thanks,
> Fabrice
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Hi All,

I do have exactly the same issue: All mails with headers containing 
UTF-8 are rejected.
I was able to catch that issue since those emails are forwarded from 
Gmail and kept there.

It would be nice if someone could provide a hint as to how to fix or 
bypass this header check.

Thanks in advance for your help,
tlux