Different Content Types in email

Question

I was reviewing the source of some emails sent to me and noticed in one that the content type for the text part is different from the HTML part - see below.

--_----------=_MCPart_1153762294
Content-Type: text/plain; charset="us-ascii";

--_----------=_MCPart_1153762294
Content-Type: text/html; charset="utf-8"
Content-Transfer-Encoding: quoted-printable

I was wondering if this is okay to have this? The email was sent from Monkey Wrench via MailChimp server.

Solution

Seeing the complete headers and body would be necessary to fully answer your question, but given what we have: Yes, it's okay to have this. Presumably the message itself is multipart, and these are snippets from two of the parts in the message body.

Edit: Here's a more complete message that I shamelessly stole (from: Send Html page As Email using "mutt"). It includes all the parts you mention, and it is perfectly legit if somewhat simplistic:

Subject: test html mail
From: [email protected]
To: [email protected]
Content-Type: multipart/alternative; boundary=bcaec520ea5d6918e204a8cea3b4

--bcaec520ea5d6918e204a8cea3b4
Content-Type: text/plain; charset=ISO-8859-1

*hi!*

--bcaec520ea5d6918e204a8cea3b4
Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<p><b>hi!</b></p>

--bcaec520ea5d6918e204a8cea3b4--