sendmail

About

Sendmail is a free/open-source email server that handles both relay and delivery. The documentation is very detailed but also unclear on many critical points.

If you want to use Sendmail from the command-line as a way of generating test messages, see Postfix/fixing or 5 Ways to Send Email From Linux Command Line. (The latter method works even when Sendmail is actually Postfix.)

Notes

• /features are invoked and configured in the sendmail.mc file
• /files: files used by sendmail
• /macros are used in various places
• /procmail: still trying to figure out how to get these to work together
• /SSL: configuring secure connections

Links

Reference

• home page redirects here
  • Introduction (configuration)
  • OSTYPE: documents a lot of config directives. Is "OSTYPE" a config-file section, or what?
  • Features (configuration thereof)
  • SMTP authorization
  • Anti-Spam Configuration Control
• Wikipedia
• IBM AIX: not sure if this is standard sendmail
• How do I use Sendmail?

How To

• Linux Server How To - Configure Sendmail
  • Linux Server How To - Filtering Spam on a Sendmail Mail Server: suggests installing SpamAssassin, but doesn't say how to get it working with sendmail

Notes

To enable sendmail to use STARTTLS, you need to:
1) Add this line to /etc/mail/sendmail.mc and optionally
   to /etc/mail/submit.mc:
  include(`/etc/mail/tls/starttls.m4')dnl
2) Run sendmailconfig
3) Restart sendmail