server: imap.example.com
port: 993
ssl: true
username: example_user
password: example_password
folder: INBOX
sleep_time: 1750
pushover_token: abcdefghijklmnopqrstuvwxyz
pushover_user: 01234567890abcdefghijklmno
pushover_sound: pushover
pushover_device: ~
pushover_url: http://mail.example.com
pushover_url_title: Read mail
pushover_retry: 60
pushover_expire: 300
body_length: 200
notify_words:
  important: 1
  gmail: 0
  hotmail: 0
  outlook: 0
  ' ': -1

server: imap.example.com
port: 993
ssl: true
username: example_user
password: example_password
folder: INBOX
sleep_time: 1680
pushover_token: abcdefghijklmnopqrstuvwxyz
pushover_user: 01234567890abcdefghijklmno
pushover_sound: pushover
pushover_device: ~
pushover_url: http://mail.example.com
pushover_url_title: Read mail
pushover_retry: 60
pushover_expire: 300
body_length: 200
notify_words:
  important: 1
  gmail: 0
  hotmail: 0
  outlook: 0
  ' ': -1

Reduce sleep_time to follow RFC properly
Reduce sleep_time to follow RFC properly

RFC 2177 says clients should end and restart IDLE every 29 minutes.
The old value of 1750 seconds was slightly longer than that, now it's
reduced to 28 minutes and complies with the RFC.
