Your global name is separate from your login name (and, for security reasons, they should not be the same, and you should not tell anyone what your login name is). You can find your global name by going to Menu -> Chat Handle. It will begin with an @ sign. This is the name you need to put in the "To:" line in the email. You can send email to character names or to global names, but you can only send inf/attachments to global names.
For example, if your global name is @Emjack, your email should look something like this:
If you want to send an item, drag it into the box that says Attachment.
Also, welcome back 
Tyvm
Can someone give me a step by step directions on how I transfer my money from one character to another character through the in-game email? Someone told me that I have to use my global name. I don't know what this means. I put in my login name, subject, remarks & $1000 then click send but nothing happens. I tried another character's name but nothing happened. I haven't been in the game for 3 years and don't remember how to do this. I need step by step instructions please.