Is there any special reason for retr bytes be null in the logs (POP3)? dovecot: May 02 06:22:52 Info: pop3(xxx): Logout. top=1/1431, retr=0/ del=0/1, size=52448 dovecot: May 02 05:42:41 Info: pop3(xxx): Logout. top=42/61155, retr=0/ del=0/43, size=651803 Config: pop3_logout_format = top=%t/%T, retr=%r/%R, del=%d/%m, size=%s