If an email contains HTML, Gmail, for example, renders the body as HTML. How can I check that the plain text version also works?
When you get an email on Gmail click on the small button on the right of reply and choose 'show original'.

If it is a multi-part message it will show you what was sent to the Gmail server. Do a quick search for:
----=_---NextPart--=_
You should be able to find the multi part messages which consists of text/plain or text/html, similar to below:
Content-Type: text/plain; charset=utf-8
Content-transfer-encoding: quoted-printable
Content-Type: text/html; charset=utf-8
Content-transfer-encoding: quoted-printable
If your platform allows to send the multi-part individually then you can send them separate and you will get both the emails separate in your inbox.
Hope that helps.
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