My wife and I are n00bs to ESO, having just bought the game a little over a month ago. We each have a main character and an alt. We often send each other duplicate recipes and motifs via mail. Neither of us ever noticed the 10g postage cost to send mail.
My wife is online right now playing her alt. Her alt just deposited all her gold into the bank for her main. She then tried to send me mail only to get a message about insufficient gold to send mail. She exclaimed "Postage? Since when is there postage?" I did a quick search and discovered that yes, we've been paying postage for every message. We just never noticed it before because who notices 10g?
I guess you learn something new every day. I just thought it was funny. Now she's stealing items to fence for more gold.
By Azura, by Azura, by Azura!