I like playing alts. I mail stuff back and forth that's either dropped or crafted and is useful to another of my characters or sometimes a guildmate or friend.
I keep running into blocks because either too many items are mailed or I've mailed too many different characters.
You don't want gold sellers and scammers mailing people and that's important, but please loosen the rules for same-account characters, guildmates and mutual friends.
Thank you <3