https://www.ietf.org/rfc/rfc2130.txthttps://www.ietf.org/rfc/rfc2130.txt
Keio University & Panda Programming, June 1993. Nussbacher, H., "Handling of Bi-directional Texts in MIME", Israeli Inter-University, December 1993. Nussbacher, H., and Y. Bourvin
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