don't understand with fetchmail

[u8210618]

i don't understand with command i will install zimbra opensource in redhat
i will use this command to build fetchmail


vim .fetchmailrc
### DOMAINPOP SETTING ###
set no bouncemail
set postmaster postmaster@example.com
set logfile /opt/zimbra/extlog/fetchmailrc.log
poll pop3.your-isp.com with protocol POP3, with options uidl
localdomains example.com
no dns
envelope "Envelope-to"
user "pop3user" there with password "pop3password" is *
here
with options rewrite fetchall

#build fetchmail log file
mkdir /opt/zimbra/extlog/
touch /opt/zimbra/fetchmailrc.log

i don't understand about question
1. user "pop3User" "pop3password" what is the meaning when i want to add other one what line to add it
2. envelope to want to use all user or one line to add
3. this command is correct or not for fetch mail from isp in ex. my isp is example.com

[Dirk]

Unless you are trying something unusual, you dont need to understand fetchmail at all, as it's not used by Zimbra in any way.

Have you actually installed zimbra yet? If not, read up on some of the documents in the Zimbra Wiki, there's a lot of information there, and there are step by step install guides too.

[dalmate]

@Dirk:
sometimes, we need to use online - offline model with our mail server.
But if we only use zimbra, it can't serve the functions we want, such as: domainPOP. So we must use fetchmail, it can help us about that problems.
Why you said that: it's not used by Zimbra in any way, you don't need to understand fetchmail at all?
It's not an unusual action when you try to make zimbra can do as we need.
@u8210618: you can visit here to know more information about the fetchmail Manual Page - fetchmail(man)
or you can install fetchmailconf (in ubuntu, please type: get-apt install fetchmaiconf). It's fetchmail config by GUI.
Hope this help.