Sendmail Knowledge Base

The sendmail configuration notes and configuration templates found on this page are a work in progress. They have been used to configure sendmail for specific applications. They are here to serve as a guide, and they are not a substitute for an understanding of sendmail.

Sendmail DNSBL Configuration:

This as a template to allow sendmail to use DNSBL. This specific example uses a few DNSBL services. Use of a DNSBL can cause mail delivery problems, if the service is later shutdown.

• Configure Sendmail to use DNSBL

Sendmail Bad Recipient Throttle Configuration:

This option will throttle smtp connections once a threshold is reached for bad recipients.

• Configure Sendmail to use Bad Recipient Throttling

Sendmail Greet Pause Configuration:

This option will cause sendmail to pause briefly prior to responding with a 220 greeting message.

• Configure Sendmail to use Greet Pause

Sendmail Connection Rate Throttle Configuration:

This causes sendmail connections to wait their turn when the number of incoming simultaneous sendmail connects exceed the connection rate throttle threshold.

• Configure Sendmail to use Connection Rate Throttle

Sendmail Greeting:

This option will cause sendmail to answer as a specific hose.

• Configure Sendmail Greeting

Sendmail TLS:

Sendmail TLS configuration and commands needed to generate certificates.

• Configure Sendmail TLS

Sendmail Auth settings:

These are configuration settings for a server running sendmail with SASL & Auth.

• Configure Sendmail Auth

Sendmail use local account for SASL:

This is the configuration needed to have sendmail use a local account for AUTH.

• Configure Sendmail Local Auth with SASL

Alter Sendmail sendmail Login Message:

Use this code to change the sendmail login message.

• Alter Sendmail Login Message