sendmail strips all the nonescaped quotation
marks (those not prefixed with a backslash) from a key before looking
it up. For example, the following key:
"Bob "bigboy" Roberts \(esq\)"@bob.com
will have its nonescaped quotation marks removed and end up looking
Bob "bigboy" Roberts (esq)@bob.com
Note that all escaped characters are de-escaped (have the backslash
removed) during this process.
When quotation marks and escaped characters need to be preserved in a
key before it is looked up, you can use the -q
switch with the K configuration command. The
-q switch suppresses dequoting and de-escaping.