I believe this looks OK, but CypherTrust IronMail sees this line as a
MIME violation:
Content-Type: application/octet-stream;
boundary="=_622_1135029170_19710"
CypherTrust says the same boundary cannot be redefined.
the error message is misleading, and it probably does indicate a bug in
CypherTrust. there is also a bug in the library you are using to
generate these messages.
the application/octet-stream does not have a boundary parameter defined
for it, so this parameter is meaningless and should not be included by
your library.
on the other hand, CypherTrust also seems to be buggy, or at least
confused. content-type parameters are defined on a per-content-type
basis. if there were a boundary parameter defined for
application/octet-stream it would not have the same meaning as the
boundary parameter for multipart. it is always possible that a
content-type can be redefined to have new parameters. message reading
software should not make assumptions about the meaning of unrecognized
parameters.
Keith
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