[exim] Content scanning and non-MIME messages

Is acl_smtp_mime (or acl_not_smtp_mime) called at all for non-MIME
messages, ie. those encoded as us-ascii with no MIME-Version: and
Content-Type: headers? I expected they would be (with the whole body
treated as a single text/plain part) but now I found a message of this
type in my store which apparently hasn't been scanned.

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