Sadly, NOTAM spam is a persistent thorn in the world aviation community's side. Bureaucratic rump-covering exercises lead to NOTAMs being issued and distributed that are mere noise to the average airman, leaving them pawing through pages and pages of briefing packets looking for a needle in a haystack.
As airmen, we're largely stuck with the results of this all. While better filtering would indeed be an improvement over what we have now, it would but paper over the underlying problem: the fact that there's this sea of noise to begin with.
How can NOTAM creators and handlers can this spam problem? Are there documented practices or guidelines they can follow to reduce the amount of rubbish that gets input into AFTN and dutifully delivered to hapless airmen everywhere?