Hitachi Sprint SH-P300 Guia Del Usuario página 148

The display and editing procedures for unsent e-mail are the same as for
outgoing e-mail, and the same options are available. Refer to the section
dealing with outgoing e-mail for details.
Tip:
Once the number of unsent e-mail messages passes 10, the oldest
unsent e-mail is overwritten. However, protected unsent e-mail is not
overwritten.
Section 2: Understanding Your Phone
2J: E-mail 139