How to increase mailing speed in postfix centos 7

To increase the mailing speed in Postfix on CentOS 7, you can try the following steps:

1. Optimize Postfix Configuration:
   • Edit the Postfix configuration file /etc/postfix/main.cf and set the following parameters:
     • smtpd_banner = $myhostname ESMTP $mail_name (to reduce the time spent on banner generation)
     • smtpd_helo_required = no (to reduce the time spent on HELO/EHLO commands)
     • smtpd_timeout = 300 (to increase the timeout for SMTP connections)
     • smtpd_client_connection_limit = 1000 (to increase the number of concurrent connections)
   • Restart the Postfix service to apply the changes: sudo systemctl restart postfix
2. Tune the Postfix Queue:
   • Edit the Postfix queue configuration file /etc/postfix/queue.c and set the following parameters:
     • queue_minfree = 1000 (to increase the minimum free space in the queue directory)
     • queue_maxsize = 1000000 (to increase the maximum size of the queue directory)
   • Restart the Postfix service to apply the changes: sudo systemctl restart postfix
3. Increase the Number of Postfix Processes:
   • Edit the Postfix configuration file /etc/postfix/master.cf and set the following parameters:
     • smtp -o mydestination=example.com (to specify the destination domain)
     • smtp -o smtpd_client_connection_limit=1000 (to increase the number of concurrent connections)
   • Restart the Postfix service to apply the changes: sudo systemctl restart postfix
4. Optimize the MTA (Mail Transfer Agent):
   • Install the mta package: sudo yum install mta
   • Configure the MTA to use a faster algorithm for sorting and delivering emails: sudo mta -c /etc/mta/mta.conf
5. Use a Faster Mail Delivery Agent:
   • Install a faster mail delivery agent like opensmtpd or msmtp: sudo yum install opensmtpd or sudo yum install msmtp
   • Configure the mail delivery agent to use a faster algorithm for delivering emails
6. Monitor and Optimize Postfix Performance:
   • Use tools like postfix and mailq to monitor Postfix performance and identify bottlenecks
   • Use tools like sysdig and sysstat to monitor system performance and identify bottlenecks
7. Upgrade Postfix:
   • Check if there are any newer versions of Postfix available: sudo yum update postfix
   • Upgrade Postfix to the latest version: sudo yum install postfix
8. Disable Unnecessary Services:
   • Disable any unnecessary services that may be consuming system resources and slowing down Postfix: sudo systemctl disable <service_name>
9. Optimize System Resources:
   • Ensure that the system has sufficient resources (CPU, memory, disk space) to handle the increased load
   • Consider upgrading the system hardware or adding more resources if necessary

By following these steps, you should be able to increase the mailing speed in Postfix on CentOS 7. However, the effectiveness of these steps may vary depending on your specific use case and system configuration.