Life With Qmail - PW?

[Keith Smith]

Hi,

I'm installing Qmail via Life with Qmail.  Under section 2.5.4. Create
users and groups there is this section:

alias:*:7790:2108::/var/qmail/alias:/bin/true
qmaild:*:7791:2108::/var/qmail:/bin/true
qmaill:*:7792:2108::/var/qmail:/bin/true
qmailp:*:7793:2108::/var/qmail:/bin/true
qmailq:*:7794:2107::/var/qmail:/bin/true
qmailr:*:7795:2107::/var/qmail:/bin/true
qmails:*:7796:2107::/var/qmail:/bin/true

What does this do and why would I need it?

Thanks in advance.

Keith