Post Office Protocol 3 (POP3) commands:
- USER — Username to use for authentication
- PASS — Password to use for authentication
- STAT — Mailbox statistics (
+OK $TOTAL_MSGS $MBOX_SIZE_BYTES) - LIST — List messages (
$MSG_NUMBER $MSG_SIZE_BYTES) - RETR — Retrieve message
$MESSAGE_NUMBER - QUIT — Close connection
There are other commands, but the above are enough to pull messages.