Follow Techotopia on Twitter

On-line Guides
All Guides
eBook Store
iOS / Android
Linux for Beginners
Office Productivity
Linux Installation
Linux Security
Linux Utilities
Linux Virtualization
Linux Kernel
System/Network Admin
Programming
Scripting Languages
Development Tools
Web Development
GUI Toolkits/Desktop
Databases
Mail Systems
openSolaris
Eclipse Documentation
Techotopia.com
Virtuatopia.com

How To Guides
Virtualization
General System Admin
Linux Security
Linux Filesystems
Web Servers
Graphics & Desktop
PC Hardware
Windows
Problem Solutions
Privacy Policy

  




 

 

Postfix Documentation
Previous Page Home Next Page

Doing more work with your SMTP server processes

With Postfix versions 2.0 and earlier, the smtpd(8) server pauses before reporting an error to an SMTP client. The idea is called tar pitting. However, these delays also slow down Postfix. When the smtpd(8) server replies slowly, sessions take more time, so that more smtpd(8) server processes are needed to handle the load. When your Postfix smtpd(8) server process limit is reached, new clients must wait until a server process becomes available. This means that all clients experience poor performance.

You can speed up the handling of smtpd(8) server error replies by turning off the delay:

/etc/postfix/main.cf:
    # Not needed with Postfix 2.1
    
smtpd_error_sleep_time = 0

With the above setting, Postfix 2.0 and earlier can serve more SMTP clients with the same number SMTP server processes. The next section describes how Postfix deals with clients that make a large number of errors.

Postfix Documentation
Previous Page Home Next Page