Answer
Yes.
We have added an options button on the compose window which allows the setting of X-Priority. When set, this gives your outgoing emails a higher than normal priority.
In GMS Webmail the folder list shows a message with higher than normal priority by giving it a "!" or "!!". Other mail clients may or may not display that fact the message was sent with a higher priority.
Note: Changing the priority of a message does not affect the speed that the message is delivered.
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Keywords:webmail priority