POLL and CPS messages[Link]

EPP Poll allows registrars to pick up messages from the EPP server asynchronously. If EPP poll is enabled, poll messages are available for 1 year after an action occurs. No CPS mails are sent if poll messages are not acknowledged.

If EPP Poll is disabled, CPS e-mails are sent immediately when an action occurs. CPS e-mails are sent to your automated e-mail address, as indicated in your Profile.

The CPS section of the e-mail contains the A-label, to keep in sync with the result of EPP poll. However, the subject and body of the CPS e-mails contain the U-label as they may be read by humans.