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### Summary Closes #2489, which reported an inability to process `.p7s` files. PR implements two changes: - If the user selected content type for the email is not available and there is another valid content type available, fall back to the other valid content type. - For signed message, extract the signature and add it to the metadata ### Testing ```python from unstructured.partition.auto import partition filename = "example-docs/eml/signed-doc.p7s" elements = partition(filename=filename) # should get a message about fall back logic print(elements[0]) # "This is a test" elements[0].metadata.to_dict() # Will see the signature ```