endgrid SMTP Relay Configuration Using Postfix in SAP S/4HANA

Overview

In this blog post I have explained about how to use / configure Sendgrid as SMTP relay in SAP S/4HANA using postfix mail package in Redhat linux.

Environment Details :

Linux Version : Red Hat Enterprise Linux Server 7.6

SAP S/4HANA 1909 FPS 00

HANA 2.0 SP04

Install Postfix in Redhat Linux

Check Postfix is installed

# rpm -qa | grep postfix

Install Postfix

# yum install -y postfix

# systemctl start postfix

# systemctl enable postfix

# systemctl status postfix

Postfix status should be active (running)

Steps to be carried in Linux server:

Take backup of below files from /etc/postfix

1. main.cf

2. sasl_passwd (If already available)

# cd etc/postfix

# cp main.cf main_bkp.cf

# cp sasl_passwd sasl_passwd_bkp

Add below lines in main.cf file

# cd etc/postfix

# vi main.cf

smtp_sasl_auth_enable = yes

smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd

smtp_sasl_security_options = noanonymous

smtp_sasl_tls_security_options = noanonymous

smtp_tls_security_level = encrypt

header_size_limit = 4096000

relayhost = [smtp.sendgrid.net]:587

— Save —

Edit sasl_passwd

Note: You should have sendgrid account details to proceed further.

# vi sasl_passwd

[smtp.sendgrid.net]:587 sendgridUsername:SendgridPassword

Note: Sendgrid login account details is username & password.

# sudo chmod 600 /etc/postfix/sasl_passwd

# sudo postmap /etc/postfix/sasl_passwd

# sudo systemctl restart postfix

Check postfix status,

# sudo systemctl status postfix

Test Using Unix Command:

Create file

# vi /tmp/test.txt

— Type any content in the text file —

Example :

SMTP Mail Configuration Using Sendgrid Completed Successfully !

— Save —

mail -s “Sendgrid Configuration Mail” example@gmail.com < /tmp/test.txt