If you are citing several e-mails sent on the same day to the same correspondent, use the subject line of the e-mail to differentiate between the messages in both your in-text references and works-cited-list entries.
Yamada mentioned that he would be traveling in Spain on 28 August, so he would not be able to meet with his coauthor on that day (“Meeting”). So Yamada suggested that they meet next month after he returned from his trip on 2 September (“Rescheduling Meeting”).
Works Cited
Yamada, Tatsuya. E-mail to Allison Jones with the subject line “Meeting.” 15 Aug. 2023, 9:15 a.m.
———. E-mail to Allison Jones with the subject line “Rescheduling Meeting.” 15 Aug. 2023, 8:05 p.m.
If the subject line of the e-mails are identical, use the time the e-mail was received to differentiate them.
Aria Willis wrote to her agent, Cynthia Maguire, that she expected to finish writing the next book in the series by September 2021 (11:05 a.m.). However, she later revised that estimate to November 2021 (3:01 p.m.).
Works Cited
Willis, Aria. E-mail to Cynthia Maguire with the subject line “Finishing the Book.” 1 July 2021, 11:05 a.m.
———. E-mail to Cynthia Maguire with the subject line “Finishing the Book.” 1 July 2021, 3:01 p.m.
For more information on including time stamps in works-cited-list entries, see section 5.80 of the ninth edition of the handbook.
Work Cited
MLA Handbook. 9th ed., Modern Language Association of America, 2021. MLA Handbook Plus, 2021, mlahandbookplus.org.