[Rspamd-Users] Block emails with Chinese and Cyrillic characters in the subject

[Marcus MERIGHI]

Hello Andreas, 

without bothering the list I wanted to say thanks for sharing!

Marcus

rspamd at linuxmaker.com (Andreas Günther), 2026.04.22 (Wed) 08:40 (CEST):
> Am Mittwoch, 6. August 2025, 16:08:19 Mitteleuropäische Sommerzeit schrieb Steve 
> Witten:
> > Here are the relevant regexps in
> > $LOCAL_CONFDIR/local.d/maps.d/blacklist/content.map:
> > 
> > # Non-Western charsets
> > #
> > /(=\?|charset\=)big5/i                  # Big5
> > /(=\?|charset\=)euc-kr/i                # Extended Unix Code -- Korean
> > 
> > /(=\?|charset\=)windows-1251/i          # Windows 1251
> > /(=\?|charset\=)koi8-r/i                # Cyrillic
> > /(=\?|charset\=)gb2312/i                # Chinese
> > /(=\?|charset\=)ks_c_5601-1987/i        # Hangul (Korean)
> 
> 
> These are outdated rules. They're barely effective anymore because they recognize 
> outdated language-specific character sets like windows-1251, gb2312, or big5, while 
> modern spam emails almost always use universal UTF-8.
> 
> 
> That's why my solution is this:
> 
> 
> /etc/rspamd/local.d/multimap.conf
> MIXED_NONLATIN_SUBJECT { 
>    type = "header"; 
>    header = "Subject"; 
>    map = "${LOCAL_CONFDIR}/local.d/maps.d/mixed_nonlatin.map"; 
>    symbol = "MIXED_NONLATIN_SUBJECT"; 
>    description = "Cyrillic, Chinese, Arabic or other non-Latin subject"; 
>    regexp = true; 
>    score = 6.0; 
>    action = "reject"; 
> }
> 
> and in 
> /etc/rspamd/local.d/maps.d/mixed_nonlatin.map
> 
> /\p{Cyrillic}/u 
> /\p{Han}/u 
> /\p{Arabic}/u 
> /\p{Hangul}/u 
> /\p{Hiragana}/u 
> /\p{Katakana}/u
> 
> 
> Best regards
> 
> 
> Andreas 
> -- 
> Users mailing list
> Users at lists.rspamd.com
> https://lists.rspamd.com/mailman/listinfo/users