command..

I've checked some of the CVARS (I have the relatively new ones) and there's nothing that pays for the gold.
If you COULD, however, it would be simple to send an item:
"send_mail_item userid itemid; pay_mail_fee (example command)"
Is it userid then item or item then user?

Well so far i tried some of them like
send_item_mail [username] [item] mailtype_express/regular
send_item_mail [username] [item] mailtype_express/regular fee
send_item_mail [username] [title] [body] [item] fee/mailtype
and none of them seem to work

Youre forgetting the sender.

Wouldn't the person using the command be preset as the sender?

I'm just basing it off send_mail where it is
send_mail [userid] [title] [body]
and you dont need a sender id for that.

Just fyi, Vindictus doesnt use that command when you send a mail

Does that mean it's just a random non-used command?
I'm sure there are quite a few of those...

Yep, thats possible. Maybe they used it once, but they dont use it anymore

yeaa im pretty sure this isnt goin anywhere :/
good try though
if only someone could figure out how to request a payment i guess?

Yeah, the payment totally throws this off. Maybe if we could remove that aspect, but that's not going to happen.

trying to send real mail with a cod cost but no item will result in the same error message
maybe that could enlighten us somehow

Maybe it's not registering the item you added?