NationStates Jolt Archive

I was wondering about a feature of Yahoo!'s sent mail system that I know I've seen before (or maybe it was something else ...) but can't seem to find now. The mail that is saved in the outbox...how can I tell if it has been read by the recipient or if it hasn't?

Thanks -- this is going to bug me all night if I don't figure it out.

you cant. it doesnt have that option. well my yahoo doesnt. are you using the free version or an upgrade that youre paying an annual fee?

Free version. Bah, oh well. Must have been some other program then...