Html email displaying as text

Trying to send a multipart html email to my Lotus address from unix mailx and sendmail, but the multipart metadata and html tags are showing as text instead of being processed by Lotus. Strangely I had this working using sendmail with one example a week ago, then I deleted that example and all others I have tried this week are not processed as html. Below is my latest example (that I got from the web) that does not work. Any ideas?

Content-Type: multipart/alternative;

boundary="----=_NextPart_000_001B_01C52196.92F3CF30"

Importance: Normal

This is a multi-part message in MIME format.

------=_NextPart_000_001B_01C52196.92F3CF30

Content-Type: text/plain; charset=“iso-8859-1”

Content-Transfer-Encoding: 8bit

here’s where the plain text part appears

------=_NextPart_000_001B_01C52196.92F3CF30

Content-Type: text/html; charset=“iso-8859-1”

Content-Transfer-Encoding: quoted-printable

Html text.

------=_NextPart_000_001B_01C52196.92F3CF30–

Subject: html email displaying as text

I found the problem - there can be no space (blank line) between the Subject: line and the first line of the multipart Content-Type declaration.