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There are three modules which can be used for sending emails to students and their differences are shown as the following table:

Module Delivery Time Attachments Group Sending
MessageImmediatelyNoNo
QuickmailImmediatelyYesYes
Announcements (Forum)30 minutes ~ 1 hour
(allow the writer to have 30 minutes for modifying the post and then send alert message within 30 minutes)
YesYes