@ECHO OFF
SET ERRORS=0
:: Use your own mappings and search strings here
NET USE P: | FIND /I "%username%" >NUL 2>NUL
IF ERRORLEVEL 1 CALL :ErrorMsg P:
NET USE S: | FIND /I "system" >NUL 2>NUL
IF ERRORLEVEL 1 CALL :ErrorMsg S:
:: Create an e-mail message if any errors were detected
IF %ERRORS% GEQ 1 CALL :Mail
:: Clear variables used in this batch file
FOR %%A IN (BODY DATE ERRORS LINE MESSAGE TIME) DO SET %%A=
GOTO :EOF

:ErrorMsg
SET /A ERRORS = %ERRORS% + 1
NET USE %1 >NUL 2>NUL
IF ERRORLEVEL 1 (
	SET BODY=%BODY%%%0D%%0ADrive%%20%1%%20not%%20mapped
	GOTO :EOF
)
FOR /F "TOKENS=3* DELIMS= " %%A IN ('NET USE %1 ^| FIND "Local name"') DO SET MESSAGE=Drive%%20%%A%%20mapped%%20to%%20
:: Replacement of backslashes "\" by "%%5C"
:: prevents interpretation of "\n" as CR/LF
FOR /F "TOKENS=3,4* DELIMS=\ " %%A IN ('NET USE %1 ^| FIND "Remote name"') DO SET MESSAGE=%MESSAGE%%%5C%%5C%%A%%5C%%B
SET BODY=%BODY%%%0D%%0A%MESSAGE%
GOTO :EOF

:Mail
FOR /F "TOKENS=2*" %%A IN ('DATE/T') DO SET DATE=%%A
FOR /F %%A IN ('TIME/T') DO SET TIME=%%A
START mailto:helpdesk@ourdomain.com?subject=Drive%%20mapping%%20error^&body=At%%20%DATE%,%%20%TIME%,%%20user%%20%USERNAME%%%20encountered%%20the%%20following%%20drive%%20mapping%%20error(s)%%20on%%20%COMPUTERNAME%:%%0D%%0A%BODY%
GOTO :EOF