From what I understand there is no specific phobia for people who are afraid of mail. Most just call it Mail Phobia...
Phobiactic.
Because they are afraid
Insecure
a wuss
a big baby
a fear or phobia
The common term is a mail thief.
outspoken?
nahh
a mail man
Nosophobia, Nosemaphobia or Pathophobia.
Call the police on them