Long newsletter submissions?

Are there any restrictions on the length of articles submitted for the newsletter?

My current draft of an article is between 40,000 and 50,000 characters - and it's likely to get a bit longer rather than shorter.

As I understand it, there is a restriction on the length of the synopsis that has to be given of the article, but no restriction on the length of the article itself (although an article may simply be long because it is poorly written and could be rejected for this reason).

Also, given the length of the article, I wondered it is possible to include some sort of bbcode to mark the beginning of various "sections" so that links can be given direct to a section within the post. The only way I've worked out to do this in the past has been to break my article up into various separate posts so that I can give a link to each single post, as I did in my "Free UFO Researcher Starter Pack" article.

Kind Regards,

Isaac