[學習] [Linux] 使用Ubuntu如何從命令列透過mutt及gmail寄信

• 安裝mutt：
  sudo apt-get install mutt
  
  
• 設定mutt：
  sudo gedit ~/.muttrc
  set from = "USER@gmail.com"
  set realname = "NAME"
  set imap_user = "USER@gmail.com"
  set imap_pass = "PASSWORD"
  set folder = "imaps://imap.gmail.com:993"
  set spoolfile = "+INBOX"
  set postponed ="+[Gmail]/Drafts"
  set header_cache =~/.mutt/cache/headers
  set message_cachedir =~/.mutt/cache/bodies
  set certificate_file =~/.mutt/certificates
  set smtp_url = "smtp://USER@smtp.gmail.com:587/"
  set smtp_pass = "PASSWORD"
  set move = no
  set imap_keepalive = 900
  
  
• 產生資料夾：
  sudo mkdir -p /.mutt/cache
   
• 送出信件範例： 
  範例1：  mutt -s "Test from mutt" user@yahoo.com < /tmp/message.txt
  範例2：  mutt -s "Test from mutt" user@yahoo.com < /tmp/message.txt -a /tmp/file.jpg
  範例3：  echo "This is the body" | mutt -s "Testing mutt" user@yahoo.com -a /tmp/XDefd.png
  
  -s "Test from mutt" 是信件標題
  -a /tmp/file.jpg 是要寄的附件
  /tmp/message.txt 是信件內文的內容