How to configure fetchmail on Ubuntu server 18.04?

Can anyone suggest how to configure fetchmail to collect emails without deleting from the server and clients can connect to via fetchmail e-mail client. The Internet channel is narrow? username and password 1 for all, i.e. all mail coming on 1 box, you want the server collected all mail to local server and gave out, and close for tcp/udp.
April 7th 20 at 10:55
1 answer
April 7th 20 at 10:57
man fetchmail
-k, --keep
(Key: keep) Stores the received messages on a remote mail server. Normally when you receive a message deleted from the server. Option to keep saves received messages in your Inbox on the mail server. This option does not work with ETRN or ODMR.

Clients cannot connect to fetchmail. Fetchmail is only for receiving mail from remote servers and transfer it to the local mail server. So without a thread of postfix/exim/dovecot and their settings, you can not do.

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