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OracleLinux8.6 : Anti-virus , Mail server installation

Install clamav ( anti-virus software )

1.Clam AntiVirus Install

2.Edit Clam AntiVirus configuration file

3.Virus definition file update settings

4.Virus definition file update

5.Start Clam AntiVirus

6.Perform 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

Exclude sys and proc directories.

9.Scheduled virus scan
10.Run a trial script and do a full scan (takes a while)

Mail Server Installation

1. Postfix Install

1.1 Install Postfix and build an SMTP server

Confirm Postfix is installed

1.2 Register Postfix to the service

1.3 Backup postfix configuration files, and files

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

Allow SMTP port (port 25)

1.5 Start Postfix

2.Dovecot Install

2.1 dovecot 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 it

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  : "" that I just added.
Password  : Password for user huong
Click on "Configure manually"

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

⑤The following settings were found by probinfg the given server

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

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

Mail server : Postfix + Clamav + Amavisd + SpamAssassin

1.Real-time scanning of e-mails

①Install Amavisd and Clamav Server
➁Configuration File Editing
➂Setup and start Amavisd
④Postfix Configuration
# systemctl restart postfix
⑤I 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

2.Anti-Spam Measures for Emails

 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
⑥If you send an e-mail to yourself in Thunderbird with the following information in the body, the following will appear in the header.