x-subscription header tag

[valuehosted]

Could the x-subscription mail tag below be included the header and would it make a difference?

--Tone

mail tag:
X-Subscription: Subscribed on 08/23/2004, via web form, by 12.221.xxx.xxx, from http://ez-search-engine-optimization.com/article-writing-course.htm

[DW]

This is a very good suggestion!  I plan on expanding on headers very soon.  I hope to provide things like return receipts, priority levels, and now this!