The strange thing is that this $MIME::Entity::BOUNDARY_DELIMITER variable isn't being used in MIME::Entity (or anywhere else in the entire MIME-tools package).  In other words, setting it presumably has no effect...

...despite this entry in SOAP::Lite's Changes file:

0.60 Mon Aug 18 12:10:27 2003
  ...
  ! Fixed MIME interoperability bug with Apache Axis - Axis' MIME
    parser requires that MIME boundaries are terminiated by a CRLF
    character where the MIME::Tools package only outputs a CR
    character. A patch was integrated into the MIME::Tools module
    which allows SOAP::Lite to specify its own MIME Boundary delimiter
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