Installation of Postfix Mail server to send notices from Koha

kohageek.blogspot.com/2012/09/configure-gmail-with-postfix-to-send.html

1. Installation of postfix mail server

Open a terminal and apply the following commands one by one,

sudo apt-get update

sudo apt-get install postfix

Select no configuration in the post installation screen.

2. Copy the configuration file.

sudo cp /usr/share/postfix/main.cf.debian /etc/postfix/main.cf

3. Install following packages too

sudo apt-get install libsasl2-2

sudo apt-get install libsasl2-modules

sudo apt-get install ca-certificates

4. Open the following file and add few lines.

sudo leafpad /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.

Either use an existing Gmail account or create a new one for the purpose send notices from Koha. Google turning off less secure app access to G Suite accounts. Use the following link to finish two-step verification for Google accounts. Create an app password for email clients (e.g. Exim, Postfix). https://support.google.com/accounts/answer/185833?hl=en

Open the following file and add Google app password of Gmail.

sudo leafpad /etc/postfix/sasl_passwd

Add the following line in the opened file.

[smtp.gmail.com]:587    urgmailid@gmail.com:yourpassword

Add your Gmail username and password.

6. Change the permission of the following file.

sudo chmod 400 /etc/postfix/sasl_passwd

7.  Translate the /etc/postfix/sasl_passwd to Postfix lookup tables.

sudo postmap /etc/postfix/sasl_passwd

8. Create the /etc/aliases.db

sudo postalias hash:/etc/aliases

9. Create the /etc/postfix/cacert.pem.

sudo cat /etc/ssl/certs/Equifax_Secure_CA.pem >> /etc/postfix/cacert.pem

For Ubuntu 18.04 LTS Users

sudo cat /etc/ssl/certs/thawte_Primary_Root_CA.pem >> /etc/postfix/cacert.pem

10.  Restart Postfix.

sudo /etc/init.d/postfix restart

11. Enable email service in Koha

Execute following command in a terminal

sudo koha-email-enable library

12. Enable less secure apps in Gmail account

Visit the link. 

http://kohageek.blogspot.in/2016/02/how-to-solve-email-sending-problem-with-gmail.html

13. Check the following settings in Koha to send email notices,

Koha > Administration > Patron categories > Overdue notice required > Yes
[Check for each patron category]

Koha Administration > Global System Preferences > Patrons > Enhancedmessagingpreferences > Allow

Set Koha >  Tools > Overdue Notice/status triggers