SendMail and SendGrid Configuration Server-Side on CentOS/RHEL/Ubuntu
SMTP (Simple Mail Transfer Protocol) is a easy way to send email from one server to another. SendGrid provides an SMTP service that allows you to deliver your email via our server instead of your client or server.
See Also:
Install Required Packages:
First, we need to install sendmail packages. Use mention command you install the required packages as per your OS flavor.
For RHEL/CentOS 6/7
# yum install cyrus-sasl-plain sendmail sendmail-cf
For Ubuntu 16.04/18.04
# apt-get install libsasl2-modules sendmail sendmail-cf heirloom-mailx
Configuration:
Edit the mail access file and add the SendGrid information in the file.
# vim /etc/mail/access
AuthInfo:smtp.sendgrid.net "U:YOUR_SENDGRID_USER" "P:YOUR_SENDGRID_PASSWORD" "M:PLAIN"
Run the following command to generate the access.db database map:
# makemap hash /etc/mail/access.db < /etc/mail/access
SendMail Configuration:
Now do the sendmail configuration to use SendGrid as our smart host.
For RHEL/CentOS
# vim /etc/mail/sendmail.mc
Comment out the following line.
dnl define('SMART_HOST', 'smtp.your.provider')dnl
Add new lines with the following code:
define('SMART_HOST', 'smtp.sendgrid.net')dnl
FEATURE('access_db')dnl
define('RELAY_MAILER_ARGS', 'TCP $h 587')dnl
define('ESMTP_MAILER_ARGS', 'TCP $h 587')dnl For Ubuntu
# vim /etc/mail/sendmail.mc
define('SMART_HOST', 'smtp.sendgrid.net')dnl
FEATURE('access_db')dnl
define('RELAY_MAILER_ARGS', 'TCP $h 587')dnl
define('ESMTP_MAILER_ARGS', 'TCP $h 587')dnl Regenerate SendMail:
To make your changes accessible to Sendmail, regenerate sendmail configuration file using the m4 command.
# m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf
Restart SendMail
Now restart the Sendmail service using following commands.
# service sendmail restart
Test SendMail Configuration:
Test the changes by using the following mail command.
#echo "SendGrid and SendMail Configuration" | mail -s "Mail Subject" support@techoism.com
Reference:
Enjoy it!
