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
Answertopia.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

General mail receiving performance tips

  • Read and understand the maildrop queue, incoming queue, and active queue discussions in the QSHAPE_README document.

  • Run a local name server to reduce slow-down due to DNS lookups. If you run multiple Postfix systems, point each local name server to a shared forwarding server to reduce the number of lookups across the upstream network link.

  • Eliminate unnecessary LDAP lookups, by specifying a domain filter. This eliminates lookups for addresses in remote domains, and eliminates lookups of partial addresses. See ldap_table(5) for details.

When Postfix responds slowly to SMTP clients:

  • Look for obvious signs of trouble as described in the DEBUG_README document, and eliminate those problems first.

  • Turn off your header_checks and body_checks patterns and see if the problem goes away.

  • Turn off chroot operation as described in the DEBUG_README document and see if the problem goes away.

  • If Postfix logs the SMTP client as "unknown" then you have a name service problem: the name server is bad, or the resolv.conf file contains bad information, or some packet filter is blocking the DNS requests or replies.

  • If the number of smtpd(8) processes has reached the process limit as specified in master.cf, new SMTP clients must wait until a process becomes available. Increase the number of processes if memory permits. See the instructions given under "Tuning the number of Postfix processes".

Postfix Documentation
Previous Page Home Next Page