You should print $command. You'll notice all your backslashed single quotes aren't backslashed anymore. And your @polit's are probably missing too. That's what you get for using a double-quoted string!

$command = q{
  insert into mailstore.received
  (SenderName, SenderEmailAddress, SentOnBehalfOfName, ReplyRecipientN
+ames,
   SenderEmailType, SentOn, ReceivedTime, MessageClass, Size, Subj, Se
+ntTo,
   Unread, InternetCodepage, importance, EntryID, ConversationIndex,
   ConversationTopic, Class, BodyFormat, Body)
  values
  ("Bob O'Neill", "bob.oneill@polit.org", "Bob O'Neill", "bob.oneill@p
+olit.org",
   "SMTP", 20060407143605, 20060407150746, "IPM.Note", 27922,
   "FW: Less Than a Month to Register - 2nd Annual Sciences Forum", "B
+ob O'Neill",
   1, 20127, 1, "000...0000", "01C65....1850E",
   "Less Than a Month to Register - 2nd Annual Sciences Forum", 43, 2,
+ ?)
};
[download]

Why are you hard-coding all those fields, though? Why not send all (or many) of them in the execute()?