Это вот эти гады с ботнетом:
http://почта-5.рф (и с другими цифрами вместо 5).
Переделанный вариант для acl_check_data:
deny message = rejected because recognized as sent by Russian spambot via \
a relay authenticated with a stolen password (type 7)
condition = ${if match{$rheader_Message-ID:}\
{\N<[\dA-F]{32}@[a-z]{5}>\N}}
condition = ${if def:header_To:}
condition = ${if !def:header_Cc:}
condition = ${if !def:header_In-Reply-To:}
condition = ${if !def:header_Importance:}
condition = ${if !def:header_X-Mailing-List:}
condition = ${if !def:header_List-Unsubscribe:}
condition = ${if !def:header_Sender:}
condition = ${if !def:header_X-Sender:}
condition = ${if !eq{$sender_address_domain}{returns.groups.yahoo.com}}
condition = ${if !match{${addresses:>, ${rheader_To:}}{,}}
# single address in To
condition = ${if !forany{<, $recipients}\
{eqi{$item}{${address:${rheader_To:}}}}}
condition = ${if match{rheader_X-Mailer:}{Microsoft Windows Live Mail}}
condition = ${if match{rheader_To:}{\N=\?windows-1251\?B\?\N}}
condition = ${if match{rheader_Date:}{\N \+0600\N}}
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