Optimizing the MTA
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Optimizing the MTA
You can adjust how the MTA functions to optimize its performance. Before attempting optimization,
you should run the MTA long enough to observe its efficiency and its impact on other network
applications running on the same server. See
Chapter 42, “Monitoring the MTA,” on page 645
.
Also, remember that optimizing your network hardware and operating system can make a difference
in MTA performance.
The following topics help you optimize the MTA:
Section 43.1, “Optimizing TCP/IP Links,” on page 675
Section 43.2, “Optimizing Mapped/UNC Links,” on page 676
Section 43.3, “Optimizing the Routing Queue,” on page 680
Section 43.4, “Adjusting MTA Polling of Closed Locations,” on page 680
43.1 Optimizing TCP/IP Links
Using startup switches in the MTA startup file, you can fine-tune the performance of TCP/IP links.
Section 43.1.1, “Adjusting the Number of MTA TCP/IP Connections,” on page 675
Section 43.1.2, “Adjusting the MTA Wait Intervals for Slow TCP/IP Connections,” on
page 676
43.1.1 Adjusting the Number of MTA TCP/IP Connections
When using TCP/IP links between domains, you can control the number of inbound connections the
MTA can establish for receiving messages.
Use the
/tcpinbound
switch in the MTA startup file to increase the maximum number of inbound
connections the MTA can establish from the default of 40 to whatever setting meets the needs of
your system. There is no maximum setting.
If the MTA is receiving more requests than it can accept, the sending MTAs must wait until a
connection becomes available, which slows down message transfer. Each connection requires only
about 20 KB. For example, if you configure the MTA to accept 600 connections, it would require
approximately 12 MB of RAM. Although there is no maximum setting for inbound connections, this
setting is adequate to handle very heavy usage. Use lower settings to conserve RAM or for lighter
usage.
MTA Web Console
You can check the maximum number of TCP/IP connections that the MTA can start on the
Configuration
page under the
TCP/IP Settings
heading.
43.1.2 Adjusting the MTA Wait Intervals for Slow TCP/IP
Connections
When using TCP/IP links, you can control how long the MTA waits for responses.
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