LINUX_SCRIPTS/settingMailAgent at main · Harshjerry/LINUX_SCRIPTS · GitHub

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📧 Postfix + s-nail Setup on CentOS

This guide explains how to set up Postfix (mail transfer agent) and s-nail (mail client) on a CentOS machine for local mail delivery.

1. Install Packages
sudo yum install -y postfix s-nail

2. Enable and Start Postfix
sudo systemctl enable postfix
sudo systemctl start postfix
sudo systemctl status postfix

3. Configure Postfix

Edit /etc/postfix/main.cf:

sudo nano /etc/postfix/main.cf


Update/add the following:

myhostname = mail.localdomain
mydomain = localdomain
myorigin = $mydomain
inet_interfaces = all
inet_protocols = ipv4
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
relayhost =
mynetworks = 127.0.0.0/8
home_mailbox = Maildir/

4. Create Maildir
mkdir -p ~/Maildir/{cur,new,tmp}
chmod -R 700 ~/Maildir

5. Restart Postfix
sudo systemctl restart postfix

6. Configure s-nail

Edit ~/.mailrc:

nano ~/.mailrc


Add:

set sendmail=/usr/sbin/sendmail
set from=root@localdomain
set realname="Local Root"
set mbox=+Inbox
set record=+Sent

7. Send Test Mail
echo "This is a test mail" | mail -s "Test Subject" root

8. Check Mail
mail


Inside the mail client:

Press Enter to read messages

Type q to quit