It corrects a bug to crash in the un-read check to be local.
A sub-menu is added to the mailbox which a menu bar is shown in. The sender email address of the un-read mail and a subject are shown in the sub-menu.
The function to play sound is added when it has more than one case by the un-read mail check. The kind of the sound is the same as "Alert sound" of the system.
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