件名

問い合わせ

• Inquiry about your products
• Quick question

お知らせ

• Sales meeting notification
• Project meeting on March 5^th
• Calculation error

お願い

• Request for payment

招待

• Invitation to a party

お祝い

• Congratulations on your promotional

お礼

• Thank you for your advice

お詫び

• Apology for the invoice mistake

指示

• Conference room arrangements
• Business trip arrangement
• Reservation confirmation