Are you quoting or paraphrasing the RFC? "While the maximum length is limited to nine characters..." is not located in RFC1459. In addition, I don't see where this is mentioned even in another wording.
I guess if there exists a server where this becomes problematic it should be fixed. The question is, are you actually testing this on a server where you could run into this "problem"? If not, it's not a real problem.
