/mail <player> msg errors until AFTER /mail read is used

[Jadiction]

When using /mail <player> msg, you get this error https://pastebin.com/raw/tcu3Ndpx

If you do /mail read you will see the message actually sent, but no confirmation messages (mail sent/received).

After /mail read is used, /mail <player> works fine.

[Vimppura69]

I think I have the same issue: Mail does not return any notifications, if you send or recieve a mail. You will ONLY get notification when sending mail to a player IF has used /mail read -command before your mail. After /mail read also that player recieves notifications from recieved mails. After server restart all mail related notifications stops working again. If you recieve mail when you are offline, you won't get any notifications from it when you join the server, even tho you have used /mail read after restart. Player relogs does not affect notifications in any way.