Message can be sorted ascending/descending order by date of receiving, message size etc.
If message size is not visible in your current interface, enable it by going through "Options" –> "Index Order" –> Add Size.
The following figure 1.2.11 highlights the flags used for sorting messages.
Figure 1.2.11:
Message sorting
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Please not that these sorting icons will only be visible in unthread view of messages. For threaded view the sorting is automatic.