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Jon, Dolphin Kit (a commercial product) currently has DSMailer, DSNeXTMailer, and plans for the release of DSMIMEMailer later this summer. I don't know if you were thinking of ªanywhere,º or ªwithin MiscKitº when you asked your question. These objects are sendmail-level mail formatters which, in the case of the NeXT & MIME formats, work at the Text level. Here are the doc's for DSNeXTMailer, FYI¼
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.