sendmail tcp parameter

[Lee Tae-kyung]

Hi, everyone~~
I want to know the recommandataion values of tcp parameters in mail server.



Best regards...

[Michael Steele_2]

Sendmail uses the smtp protocol and its port is defined in /etc/services. I believe its port 25; Like all ports less than 1000 it???s a standard port used with other O/S's and shouldn't be changed.

The Sendmail process comes with a default configuration file which can be reviewed in /usr/newconfig/etc/mail/sendmail.cf.

The actual configuration file is in:

/etc/mail/sendmail.cf.

This file should be the same on every server to have good working 'relations'. So note the byte count and compare the byte count on your other HP-UX servers.

Also check the sendmail versions of the program and the configuration file on every HP-UX server:

sendmail -bs

They should all be at the same version but many times customers forget to copy in the new configuration file, noted above in /usr/newconfig.

[W.C. Epperson]

Lee,

It's not clear what you're asking about. Are you interested in kernel parameters or sendmail parameters? Which ones?

(Michael: You can't mean literally that the sendmail.cf files should be the same on all servers, can you? Certainly they should tend to be as similar as possible, but if they all have the same Cw macro, for instance, things would be very interesting.)

[Michael Steele_2]

W.C.

Specific to the versions, for example, 8.8.6 vs. 8.9.3, etc.

[Berlene Herren · Accepted solution]

See Chapter 6 (Tune Performance) from O'Reilly's sendmail 3rd edition.

Berlene

The tuning items of highest concern for best sendmail performance are:
Maximize file descriptor limits
Disable source-routed packets
Maximize the number of simultaneous TCP/IP connections
Maximize TCP/IP buffer size
Decrease TCP/IP keepalive intervals.