I like that. Just one nit-pick: why not supply "reasonable defaults" for the @ARGV values? (So you don't have to remember/retype all that stuff every time you run it.)
And of course, since you have it working now, you might as well comment out the print "Sleep for $ARGV[3]\n" -- that output gets tiresome, doesn't it?
update: Also, since you are printing reports to STDOUT about errors and incoming mail, it might be useful to include a time-stamp with each print-out:
print "New incoming mail detected at ", scalar(localtime), "\n";
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