1) In a Mail Recovery Center 2) Like a draft e-mail 3) Like some angry email, wisely 4) Not dispatched 5) Not dispatched or transmitted 6) Not mailed 7) Not posted yet 8) Not transmitted 9) Not yet in the mail 10) Not yet mailed 11) Not yet posted 12) Still in an out-box 13) Still in the email outbox 
[adj] - not dispatched or transmitted
adjective not dispatched or transmitted; `the letter remained unwritten and unsent`