Using If else to compare Mac Address in Batch File

This is my following Code. I keep getting the error "Try again" even though my Mac Address is same. I somehow want to execute Exec.bat if the condition is true.By the way MacCheck.txt has my Mac address as 08-3E-8E-2C-DF-F7

@ echo off

SetLocal EnableDelayedExpansion

set content=

for /F "delims=" %%i in (MacCheck.txt) do set content=!content! %%i

rem %content%

SET Mac="08-3E-8E-2C-DF-F7 "

if "content" == "Mac" (start Exec.bat) else (echo "Try again")

EndLocal

pause