LG U8150 User Manual page 166

Messaging
1.1.3.2 Send settings
1.1.3.2.1 Priority
You can configure the priority of the e-mail you wish to send.
You can select either Low, Normal or High.
1.1.3.2.2 Read reply
You can set whether you want to request a read receipt for a sent
e-mail.
1.1.3.3 Send e-mail menu
1.1.3.3.1 Send & Save
Sends the created e-mail and then saves it in the Outbox. Sending
will be processed in the background, and you can do another job.
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U8150 User Guide