You may want to include the date in the subject line if your message is one of a regular series of emails, such as a weekly project report.
Ịnwere ike ịsonye ụbọchị ahụ na isiokwu ahụ ma ọ bụrụ na ozi gị bụ akụkụ nke usoro ozi ịntanetị kwa ụbọchị, dịka akụkọ nhazi nke izu ụka.