I am having the same issues here, except that it sent my mail to another person that I don’t know. I used the guild window and right clicked my friend Goqua name and said send mail. I added the items and put a title in. I did not mess with the name. Then I clicked send and he said he didn’t receive it. I then ask him to send me something and it went through. I was able to send it back to him using the same method and it go to him.
The problem here is that the first message went to some guy named Zed Tigre. I don’t know how it went to him, but he had my 120 iron and 20 silver that I was trying to send to my buddy. He sent me back my iron, but not the silver. I don’t want to use the mail system, if it has a chance of sending the mail to some random person this is a huge issue.