cte_type
Controls the type of Content Transfer Encodings that may be or are required to be used. The possible values are:
7bit | all data must be “7 bit clean” (ASCII-only). This means that where necessary data will be encoded using either quoted-printable or base64 encoding. |
8bit | data is not constrained to be 7 bit clean. Data in headers is still required to be ASCII-only and so will be encoded (see ‘binary_fold’ below for an exception), but body parts may use the 8bit CTE. |
A cte_type value of 8bit only works with BytesGenerator, not Generator, because strings cannot contain binary data. If a Generator is operating under a policy that specifies cte_type=8bit, it will act as if cte_type is 7bit.
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