Not working filters because of broken characters

Thank you for your suggestion.

I resolve this issue by using a custom filter as below

Fortunately, the mails have ‘X-Original-MAILFROM’ tag whose value is ‘outgoing@kiise.or.kr’.

So the filter can catch the mails with this condition.

Still, I think the reason for this issue is the encoding problem, but I am not sure.

Thank you for your replies again.

Yours sincerely

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