yeah thats the thing, its got the target items in to-send list and it sends them but it sends only 1 letter when you visit a mailbox, so its like i have 100+ bag slots as i start botting with empty bags, and 12 free slots as it goes to mail, sends 1 letter and goes back on gathering route

trying to reinstall the addon, just deleted its settings in wtf folder, will check it around..
upd.
looks like i found the problem, it starts panic if you add more than one recipient in omail settings, with only one nickname it sends properly all stuff that you added into to-send list and that you have in bags when visiting mailbox.
the only thing left is in pandaria herbalist gathers so much spirits of life and mana which are BoP and those dont fit herbs bag, so i had to equip more regular bags, but generally the broblem is solved