Features/NoMTA

No MTA

Summary

Don't ship a MTA by default for the desktop.

Owner

• Name: Adam Miller

• email: maxamillion [AT] gmail.com

Current status

• Targeted release: Fedora 13
• Last updated: 23 March 2010
• Percentage of completion: 90%

Working:

• Everything as designed (Aside from messages that would normally be sent via a MTA)

Done:

• Write a patch for cronie that will redirect messages that would be sent to a MTA to syslog in the event a MTA is not present. Submit patch to cronie upstream.
  • Patches written and submitted; see RHBZ #548843
  • Patch applied to cronie-1.4.4, currently in F13.

TODO:

• Modify default crond config to use syslog instead of sendmail
  • set CRONDARGS="-s -m off" in /etc/sysconfig/crond
• Patch the default configuration for logwatch to not send mail, but to send messages to stdout and then verify the patch to cronie is reporting logwatch messages to syslog accordingly.
• Verify there are no other packages that will require a patch to function without a MTA

Detailed Description

The shipping of a default MTA has long been the de facto standard, but for the vast majority of users this is simply wasted resources and wasted disk space for the packages installed. Without an MTA the utilities that would have previously delivered local mail will just simply silently not deliver mail. Instead we can redirect the output to a log and those users who need a MTA are free to install any one they so choose.

Benefit to Fedora

Less used disk space for default install, less used resources, stopping of the MTA madness.

Scope

MTAs are not a necessary daemon on a desktop system, so we need not include one by default.

cronie is the only package in a default Fedora install that requests the use of an MTA. If /usr/sbin/sendmail is not present, it will simply stop sending mail. Therefore, if we modify cronie to send job output to a log file, we can remove the requirement for an MTA with no loss of functionality.

The cron syslog facility exists for this purpose, and our current cron setup already uses it to log some messages to /var/log/cron.

Required changes:

1. Modify cronie to send job output to the cron syslog facility if sendmail is missing
   • In /etc/sysconfig/crond set CRONDARGS="-s -m off"
2. Remove Requires: /usr/sbin/sendmail from cronie's spec file
3. Add comments to default/example crontab that sendmail must be installed and CRONDARGS changed for mail sending to work

Packages that may require changes:

• cronie - RHBZ #472710
• crontabs
• logwatch

How To Test

Uninstall sendmail on your current machine and enjoy the "no warning messages, no crashing, just blissful MTA-free silence" - wwoods

User Experience

Transparent to majority of users, will add a 'yum install <insert-MTA-here>' step to advanced users who have an actual use case for a MTA on their machines.

Dependencies

none

Contingency Plan

Do Nothing.

Documentation

• None

Release Notes

• None

Comments and Discussion

• See Talk:Features/NoMTA