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header wrapping. The default is 78, as recommended (but not required)
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payload. fmt is expanded with the following keywords (in
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type : Full MIME type of the non-text part
maintype : Main MIME type of the non-text part
subtype : Sub-MIME type of the non-text part
filename : Filename of the non-text part
description: Description associated with the non-text part
encoding : Content transfer encoding of the non-text part
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