Now I know this is unlikely to even get looked at let alone put in game, but worth a shot.
As it stands when I signed up to my XIV plan I chose the option to pay more to have more than one character
Yes I get the "you can play all on one character" but for those of us who don't want too?
I wanted to experience all three nations from ground up
And as it stands none of them can communicate with each other
A simple fix would be to introduce an item you can purchase from say the world importer npc (one who sells greens for chocobo) called token of friendship.
Using the item would link all character connected to that account thus opening up the ability to mail your OWN characters
Not asking to be able to mail strangers, but to my own characters I leveled.
Please consider it, it's a staple in any mmo to communicate with your own alts, so to put such a block on it is bad and would put off anyone wanting to see other nations stories

Regards