Please help me install an SSL certificate, Webmin, and mailboxes

Hi Tom,

I dont know if you need it now,but i’d love to give you advice.For SSL,you can search acme.sh on GitHub.It’s readme document is very clear and i think you can easily make it.For mail,i dont know which mail program you want to install.Here i list senmail for you.

1. Installation services

sudo apt-get install sendmail

sudo apt-get install mailutils

ps aux grep sendmail

2. Modify the configuration

Vi /etc/mail/sendmail.mc

DAEMON_OPTIONS (`Family = inet, Name = MTA-v4, Port = smtp, Addr = 0.0.0.0 ') dnl

DAEMON_OPTIONS (`Family = inet, Name = MSP-v4, Port = submission, M = Ea, Addr = 0.0.0.0 ') dnl

#Modify Addr = 0.0.0.0 to indicate that you can connect to any server.

cd /etc/mail

mv sendmail.cf backupmail.cf.bak backup

m4 sendmail.mc> sendmail.cf error prompt sendmail-cf is not installed

3. Send a test email

echo "test" | mail -s test ***********@qq.com

#Error My unqualified host name (rivamed) unknown; sleeping for retry

/etc/mail/local-host-names

127.0.0.1 localhost

127.0.0.1 {hostname}

#Same /etc/hosts

127.0.0.1 localhost

127.0.0.1 {hostname}

#Sent an e-mail and found that the e-mail was not received. View the log and find that an error was reported. DSN: Service unavailable

#Modify hostname test.com

#Since the mailbox mechanism has been placed in the trash, just add it to the whitelist

Then go for Webmin

sudo apt update
sudo apt install software-properties-common apt-transport-https wget

wget -q http://www.webmin.com/jcameron-key.asc -O- | sudo apt-key add -

sudo add-apt-repository "deb [arch=amd64] http://download.webmin.com/download/repository sarge contrib"

sudo apt install webmin

After you install,it will show

Webmin install complete. You can now login to https://your_server_ip_or_hostname:10000/
as root with your root password, or as any user who can use sudo
to run commands as root.

By default, Webmin listens for connections on port 10000 on all network interfaces. If your server is running a UFW firewall, you need to open the Webmin port. To allow traffic on port 10000, run the following command:

sudo ufw allow 10000/tcp

Then view your web mail GUI https://your_server_ip_or_hostname:10000/ After you log in, you will be redirected to the Webmin dashboard, which provides basic information about the system.From here, you can start configuring and managing your Ubuntu 18.04 server as needed.

If you still have problems, please continue to reply.

Kind regards, Shiroka