Rewrite subject *****SPAM***** destroy charset in subject

[Daku]

Hello,
i've meet strange trouble, Message visible in rspamd, and its topic are OK but if Points go above rewrite subject limit, charset was changed.

Where i can set global charset to rewrite subject ?

It's look like UTF-8 changed to ISO so except correct Polish letters i have that


Rspamd log, charset OK -> Etykieta urzędowa, protokół dyplomatyczny

Roundcube, Thunderbird -> *****SPAM***** Etykieta urzędowa, protokół dyplomatyczny


As i see in message headers, it remove in subject - bottom message was OK, display as

Potwierdzenie doręczenia wiadomości (wyświetlono) - przekazanie oferty​

Subject: =?UTF-8?Q?Potwierdzenie_dor=C4=99czenia_wiadomo=C5=9Bci_=28wy=C5=9Bw?=
=?UTF-8?Q?ietlono=29_-_?=przekazanie oferty

Wrong message header

X-Old-Subject:Etykieta urzędowa, protokół dyplomatyczny i savoir-vivre
Subject:*****SPAM*****Etykieta urzędowa, protokół dyplomatyczny i savoir-vivre

Both messages was coded in UTF-8 after EML download.

Only one change was ?UTF-8?Q? + ascii assing of UTF8 letters e.g C59B = ś



Greetings,
Daku

 

[Daku]

I found some hint.

Rspamd if add header is triggered, then Charset in subject was destroyed, like i explain above.

Some FIX / Hint to it ?

Original language PL - UTF-8