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Sendmail tutorials

Send mail via telnet / test for open relay

Contributed by abanks on February 9, 2004 under Sendmail

Behind the scenes, the commands sent to mail servers are simple text commands. These commands can be to sent to an email server manually via telnet. This is a quick way to test an email server to determine if it is an open relay.

sendmail: process the queue manually when the load average is high

Contributed by Michilimackinac on January 13, 2004 under Sendmail

This command can be useful when the load average is high (not due to sendmail) and you want to flush all the mail off the system.

sendmail: check version, compile flags, system identity

Contributed by Michilimackinac on under Sendmail

These options to sendmail will give you some useful version and configuration information.

sendmail: process all mail to a certain user

Contributed by Michilimackinac on under Sendmail

This command is useful for processing messages to a certain user (runs through the queue)

sendmail: process mail from user

Contributed by Michilimackinac on under Sendmail

This command is useful for processing messages from a certain user (runs through the queue)

sendmail: command line alias expansion

Contributed by Michilimackinac on under Sendmail

Expand an alias using the command line

Sendmail debugging: watch queue processing

Contributed by Rex on December 1, 2003 under Sendmail

In the course of troubleshooting sendmail problems, it is sometimes helpful to watch sendmail do its thing. If there is a backlog of messages in the queue, you can run sendmail manually with a verbose option to make it act as a queue runner and see what it is doing and possibly why it is not doing what you think it should.