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Changes between Initial Version and Version 1 of Ticket #33972, comment 16

initial	v1
9	9
10	10	With this one sorted out, I believe that just by clearing up Encoding (no need to default to anything, like 8Bit as you did), just the same as all the other cleared values, will be enough to sort this problem. With this done the Unit Test should result in an empty value for the `Content-Transfer-Encoding` (like in my manual testing) as we are not explicitly setting up anything in particular (you can keep the message short, don't need to add 8 bit characters or anything like that)
	11
	12	If anyone wants to explicitely set-up the charset, they must set it with `wp_mail_charset` filter hook.
11	13
12	14	To prove that we don't really need any stunts or `8-bit` defaulting, the best way is to test everything directly with a clean `PHPMailer` object by itself to observe the default returned values.