Rocky Linux8.6 : Anti-Virus 、Mail Server

Install Clamav ( anti-virus software )

1.  Install

2. Edit Clam AntiVirus configuration file

3.Virus definition file update settings

4.Virus definition file update
5.Start Clam AntiVirus
6.Conducted virus scan
■Download a test virus and perform a virus scan
7.Deployment of virus scan auto-execution scripts
8.Virus scan exclusion directory settings
9.Scheduled virus scan execution

Install Mail Server

1. Install Postfix

1.1 install
Install Postfix and build an SMTP server

Make sure Postfix is installed

1.2 Register Postfix to the service

1.3 Backup postfix configuration files, main.cf and master.cf files

1.4Edit postfix configuration file
To prevent unauthorized mail relay, configure Postfix to require authentication even for outgoing mail, using Dovecot's SASL function.

Release SMTP port (port 25)

1.5 Start Postfix

2.Install Dovecot

2.1 install

2.2 Edit dovecot.conf file

2.3 Edit 10-auth.conf file

2.3 Edit 10-mail.conf file

2.4 Edit 10-master.conf file

2.5 Edit 10-ssl.conf file

2.6 Register dovecot as a service and start

2.7 Permission port opening for POP/IMAP service with firewalld
POP is [110/TCP], IMAP is [143/TCP].

3.Create mail user and check operation

3.1 advance preparation
①Pretreatment for new users
When a new user is added, set up the system to automatically send and receive e-mail.

②Mail environment pre-processing for existing users
Configure the already created users to be able to send and receive e-mail.
3.2 User Account Creation
3.3 operation check ①
①Log in as an email user and send a test email.
3.4 operation check ②
Set up and confirm your account in Mozilla Thunderbird
This time we will set it up with the general user huong

①Start Thunderbird, and click "Tools", "Account Settings".

②「Account Actions」「Add Mail Account」

③Your full name : Any name
Email addtess : huong@korodes.com
Password : Password for user huong
Click on "Configure manually"

④Set "INCOMMING SERVER" and "OUTGOING SERVER" as shown below and click "Re-test".

⑤Server found is displayed.(The following settings were found by probinfg the given server)

After clicking "Done," the following "Warning" appears, but there is no problem, so click "Confirm."

⑥Click "Finish" when "Account syccessfuly created" is displayed.(Account syccessfuly created)

Postfix + Clamav + Amavisd+SpamAssassin

1.Real-time scanning of email

①Install Amavisd , Clamav Server
➁Configuration File Edit
➂Setup and start Amavisd
④Postfix Configuration
⑤ Sent a test email to myself in Thunderbird, and in the header display part of the received email, I see the following
X-Virus-Scanned: amavisd-new at korodes.

2.Email spam protection

 ①SpamAssassin installed to prevent spam
②SpamAssassin Settings
③SpamAssassin configuration file modernization script
Grant execute permission to the spamassassin-update script and run it
Check that the SpamAssassin configuration file is created in the /etc/mail/spamassassin directory with the date of the day.
SpamAssassin configuration file is created as of the current date.
Set up cron to automatically run a script daily that updates the SpamAssassin configuration file
④Integrate SpamAssassin into Postfix
⑤Restart postfix
⑥When you send a blank email to yourself in Thunderbird, you will see the following in the header
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