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List Metadata fields used in messages.
metadata_options()
A vector containing message metadata fields.
vector
Crispin, M., "Internet Message Access Protocol - Version 4rev1", RFC 2060, 10.17487/RFC2060, December 1996, https://www.rfc-editor.org/info/rfc2060.
# NOT RUN { library(mRpostman) metadata_options() # }
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