掲けい題だいの件けん

expression, noun

the subject matter; the matter mentioned in the heading/subject line

A set phrase used in formal writing, especially in business emails and documents, to refer back to the topic stated in the subject line or heading. Often used at the beginning of a message to indicate that the following content is about that subject.

• 掲けい題だいの件けんについて、ご連れん絡らくいたします。

  I am writing to you regarding the matter mentioned in the subject line.

• 掲けい題だいの件けん、添付てんぷファイルをご確かく認にんください。

  Regarding the subject matter, please check the attached file.