Warning: You may be tempted to set the DELIVERY_MODULE configuration variable in mm_cfg.py to 'Sendmail' when using the Sendmail mail server. Don't. The Sendmail.py module is misnamed - it's really a command line based message handoff scheme as opposed to the SMTP scheme used in SMTPDirect.py (the default). Sendmail.py has known security holes and is provided as a proof-of-concept only⁴. If you are having problems using SMTPDirect.py fix those instead of using Sendmail.py, or you may open your system up to security exploits.

Subsections

• 6.3.1 Sendmail ``smrsh'' compatibility
• 6.3.2 Integrating Sendmail and Mailman
• 6.3.3 Performance notes

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Release 2.1, documentation updated on February 26, 2019.