SMTP mimeType ignored when set on outbound-endpoint directly or inside transformer

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I have noticed that mimeType option is ignored when set directly on smtp:outbound-endpoint :

<smtp:outbound-endpoint host="${smtp.host}" port="${smtp.port}" mimeType="text/plain; charset=UTF-8"/>

or when set on explicit string-to-email tranformer inside smtp:outbound-endpoint:

<smtp:outbound-endpoint host="${smtp.host}" port="${smtp.port}" >
			<email:string-to-email-transformer encoding="UTF-8" mimeType="text/plain; charset=UTF-8"/>
</smtp:outbound-endpoint>

The only way to force mimeType is to set it on smtp:connector and reference it inside smtp:outbound-endpoint,

<smtp:connector name="smtpConnector" contentType="text/plain; charset=UTF-8" />
<smtp:outbound-endpoint host="${smtp.host}" port="${smtp.port}" connector-ref="smtpConnector"/>