HTML rendering oddity with <ol start="...">

My RSS feed contains HTML which is then rendered through phpList as an HTML email. This works well for most of my content.

Some of my ordered lists don’t start with 1. I use <ol start="0"> to start a list a zero. This is allowed in the HTML spec.

My feeds contain that HTML, but when it is sent out as an email, it become a plain <ol>.

Looking at the HTML view of the email, the start="0" has been stripped out.
I’m sure that my email client supports the attribute because if I manually copy and past the content, it is sent fine.

Is there any way to get phpList to preserve the attributes when it generates its emails?

@edent This is caused by a configuration setting Allow only whitelisted tags in item content that has a restricted set of elements and attributes that are allowed. You can turn that off to allow the start attribute.