Message handling problems with non-English messages
I have tried sending a spam message in Korean, but when there is any Korean text inside the email even header was not recognized. I tried various combination of headers (already changed the language in English, fyi), but as long as there was any Korean text the submission was refused.
I have tried following combinations, none of them were successful:
From: spammer@example.com
To: my@example.com
Date: Sat Nov 27 15:03:19 CET 2021
Title: <<승인안내>>
From: spammer@example.com
To: my@example.com
Date: Sat Nov 27 15:03:19 CET 2021
Title: 승인안내
Title: <<승인안내>>
Date: Sat Nov 27 15:03:19 CET 2021
From: spammer@example.com
To: my@example.com
Subject: Seungin Annae
Date: Sat Nov 27 15:03:19 CET 2021
From: spammer@example.com
To: my@example.com
From: spammer@example.com
To: my@example.com
Date: Sat Nov 27 15:03:19 CET 2021
Title: Seungin Annae
Only after "machine translating" the body contents, I got the submission notice. My mail client (KMail) used base64-encoded UTF-8 when the mail contained at least 1 character of Korean:
Content-Transfer-Encoding: base64
Content-Type: text/plain; charset="UTF-8"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 used 7Bit us-ascii after machine translating the message:
Content-Transfer-Encoding: 7Bit
Content-Type: text/plain; charset="us-ascii"
---------- Forwarded message ----------
From: norepelcy_kr@daum.net
To: melcochopper@gmail.com
Date: Sat Nov 27 15:03:19 CET 2021
Title: Seungin Annae
We will guide you through the payment of your <Kakao> as follows.