Notes 6.5 and VB.NET CDO

I have a VB.NET project that uses CDO to send SMTP messages.

When messages are sent to someone with release 6 of Lotus Notes everything works fine.

However when the messages go to someone with release 6.5 the body text is tiny. Each line just looks like a hyphon.

Can anyone shed some light on why this happens, and if there is anyway around it?

Thanks,

Janine