The document provides instructions for configuring an email server on a Koha system using Postfix and Gmail. It involves installing Postfix and additional packages, configuring Postfix to use Gmail as an SMTP relay by editing configuration files, creating passwords and certificates, and enabling email in Koha. Finally, it recommends enabling security in the associated Gmail account.

1. E-mail settings in Koha:
1. Installation of postfix mail server package.
Open a terminal and apply following command,
sudo su [Enter Linux password]
apt-get install postfix
Use TAB, UP and DOWN ARROW buttons to move between various selections.
Select no configuration in the post installation screen.
2. Copy the configuration file.
cp /usr/share/postfix/main.cf.debian /etc/postfix/main.cf
3. Install following packages too
apt-get install libsasl2-2
apt-get install libsasl2-modules
apt-get install ca-certificates

2. 4. Open the following file and add some lines.
gedit /etc/postfix/main.cf
Add the following lines at the bottom of the file.
relayhost = [smtp.gmail.com]:587
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtp_sasl_security_options = noanonymous
smtp_tls_CAfile = /etc/postfix/cacert.pem
smtp_use_tls = yes
5. Create a new file to save the gmail password.
gedit /etc/postfix/sasl_passwd
Add the following line in the opened file.
[smtp.gmail.com]:587 dptkvs@gmail.com:yourpassword
Add your gmail user name and password.
6. Change the permission of following file.
chmod 400 /etc/postfix/sasl_passwd
7. Translate the /etc/postfix/sasl_passwd to Postfix lookup tables.
postmap /etc/postfix/sasl_passwd

3. 8. Create the /etc/aliases.db
postalias hash:/etc/aliases
9. Create the /etc/postfix/cacert.pem.
sudo cat /etc/ssl/certs/thawte_Primary_Root_CA.pem >> /etc/postfix/cacert.pem
10. Restart Postfix.
/etc/init.d/postfix restart
Check the following settings in Koha to start email notices,
Administration > Patron categories > Overdue notice required > Yes
Koha Administration > Patrons > Enhancedmessagingpreferences > Allow
Set Koha > Tools > Overdue Notice/status triggers
Enable email service in Koha (Run this command at terminal in ubuntu)
koha-email-enable library
11. Enable Security App in Google at https://myaccount.google.com/security
For any clarification, you may write mail at librarianguide@gmail.com
References:
1. www.koha-community.org
2. http://kohageek.blogpost.com