"Unable To Send Letter" - Why?

[Pintsized]

Trying to send mail and getting a typically unhelpful error message with no indication at all as to what's wrong!

1) The character is in my friend list, they're even in my FC, the item is a simply Orch. scroll.
2) The character was last logged in 16 hours ago.
3) The character's account is active.

What possible reason could there be for this to fail multiple times? Why do programmers output such totally unhelpful messages when something goes wrong?

[edit]

Turns out the target mailbox is full .. guess SE's programmer was just too damned lazy to bother reporting the fact to me!

[Eldevern]

Maybe his box is full. It happens when someone has letters with items in it. Usually the warming message gives this kind of information. Check the chatbox to be sure. Your friend needs to check his box and empty all letters with items.

[Vidu]

To be a bit more specific: There are two ways the inbox can be full:
1) 100/100 letters - simple, they just reached the maximum amount of letters they can hold and need to delete some.
2) To many items held in the inbox - you cant have more than 20 items in your inbox. So even if you havent reached the 100-letter-cap, you might have to many letters that have items attached to them. Accept some letter and transfer the items to your inventory.

[TheRealQuah]

[edit]

Turns out the target mailbox is full .. guess SE's programmer was just too damned lazy to bother reporting the fact to me!

No need to be a dick head mate.

[Rasikko]

Hit too close to home there?