sendmail 프로세스에 user open이라는게 왜 생겼는지??

>ps -ef | grep sendmail
    root 18411 24769  0 09:56:04 ?         0:00 sendmail: ./j1GK71e04838 smtp.ifrance.com.: user open
    root 18654 24769  0 10:26:09 ?         0:00 sendmail: ./j1GNh3e17147 popsmail.com.: user open
    root 17836 24769  0 08:55:54 ?         0:00 sendmail: ./j1GFcde19354 snu.md.: user open
    root 16153 24769  0 08:25:49 ?         0:00 sendmail: ./j1GE7Ie14453 hanmail.co.kr.: user open
    root 24769     1  0  2월 11  ?         1:02 sendmail: accepting connections
    root 14452 24769  0 07:55:46 ?         0:00 sendmail: ./j1GBYce06804 samsung.co.kr.: user open
    root 18193 24769  0 09:25:59 ?         0:00 sendmail: ./j1GHYbe26049 komoco.co.kr.: user open
  appwww 18684 18461  1 10:31:31 pts/tc    0:00 grep sendmail

프로세스중 user open이라 되있느것들이 무엇인지 모르겠내요.
왜 저런게 생겼는지 아시는분 답변좀 부탁드립니다.

Sendmail 8.11.1버젼사용중이고, 처음 설치했을때는 없던것이 오늘보니 생겼내요.