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Asked: 2018-06-11 06:33:02 +0800 CST

undefined parameters in /etc/postfix/master.cf

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The default master.cf file in a fresh installation of Ubuntu 18 seems to contain some undefined parameters:

Under both the submission block and the smtps block:

  -o smtpd_client_restrictions=$mua_client_restrictions
  -o smtpd_helo_restrictions=$mua_helo_restrictions
  -o smtpd_sender_restrictions=$mua_sender_restrictions

What's going on here? Is this a bug? Or is the package maintainer expecting us to define these ourselves?

This came up for me yesterday when I got these warnings while installing a new package:

postconf: warning: /etc/postfix/master.cf: undefined parameter: mua_sender_restrictions
postconf: warning: /etc/postfix/master.cf: undefined parameter: mua_client_restrictions
postconf: warning: /etc/postfix/master.cf: undefined parameter: mua_helo_restrictions
postconf: warning: /etc/postfix/master.cf: undefined parameter: mua_sender_restrictions
postconf: warning: /etc/postfix/master.cf: undefined parameter: mua_client_restrictions
postconf: warning: /etc/postfix/master.cf: undefined parameter: mua_helo_restrictions
postfix 18.04

1 Answers

  1. You can get rid of the error messages by adding the following in the main.cf file for postfix:

    smtpd_restriction_classes = mua_sender_restrictions, mua_client_restrictions, mua_helo_restrictions

mua_client_restrictions = permit_sasl_authenticated, reject

mua_sender_restrictions = permit_sasl_authenticated, reject

mua_helo_restrictions = permit_mynetworks, reject_non_fqdn_hostname, reject_invalid_hostname, permit

    Save main.cf and the postfix reload, then postfix check. You should see nothing being printed. That's what I did to remove the errors from my build. It seems to be a defaults left over from the build. I believe that you can comment those 3 lines out in the master.cf and then you can use smtpd_client_restrictions, smtpd_sender_restrictions, smtpd_recipient_restrictions, and smtpd_helo_restrictions in the main.cf for postfix.

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