Conditionalsecuritymultiparts, processsecuritymultiparts, retainsecuritymultiparts Channel Options

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Processing within security multiparts (conditionalsecuritymultiparts, processsecuritymultiparts, retainsecuritymultiparts)

The conditionalsecuritymultiparts, processsecuritymultiparts, and retainsecuritymultiparts channel options control the handling of security multiparts, (that is, multipart/signed and multipart/encrypted parts), by the MTA's message structure parsing code. They are particularly relevant for the conversion channel, as they control whether the conversion channel processes "inside" such multipart. retainsecuritymultiparts is the default: multipart/signed and multipart/encrypted are treated as monolithic and not "looked inside" by MIME message structure parsing. For instance, the conversion channel won't process any parts inside such parts. With processsecuritymultiparts, the conversion channel sees the parts inside the security multipart; note that enabling this breaks all signatures, since the MTA redoes all the boundary markers during its MIME structure parsing. conditionalsecuritymultiparts processes the multiparts similarly to processsecuritymultiparts, but retaining any "preamble" material inside the multipart.