Fujitsu ScanSnap S1500M Operator's Manual page 307

Actions (for Mac OS Users)
9.
Click the [Attach to E-mail] button.
An e-mail message window appears with the file attached.
You cannot start scanning when the [Scan to E-mail] window is displayed. Close the
window before scanning the next document.
Do not move, delete or rename the scanned image in other applications when the
[Scan to E-mail] window is displayed.
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