Office 365 - Apple Mail - Sort by message size
The following document explains how to sort by message size in Apple Mail.
This procedure will organize every mailbox you have in Apple Mail.
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Open Mail.
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Click View, select Message Attributes, then select Size.
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The size of the message will now appear in the preview pane.
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Click View, select Sort by, then select Size.
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Your mail will now be sorted by size.