> On Oct 1, 2019, at 9:21 AM, linkcheck <post...@linkcheck.co.uk> wrote: > > Most of the installation info I have read online gives something similar to > my original posting for master.cf. I can understand removing the smtp_cert > lines from the smtp section (hence the question) but was not aware I did not > need any cert specifications in master.cf.
See http://www.postfix.org/master.5.html (or man -s 5 master). SYNTAX ... Command name + arguments ... -o name=value (short form) Override the named main.cf configuration parameter. The parameter value can refer to other parameters as $name etc., just like in main.cf. See postconf(5) for syntax. NOTE 1: With the "long form" shown above, whitespace after "{", around "=", and before "}" is ignored, and whitespace within the parameter value is preserved. NOTE 2: with the "short form" shown above, do not specify whitespace around the "=" or in parameter values. To specify a parameter value that contains whitespace, use the long form described above, or use commas instead of spaces, or specify the value in main.cf. Example: /etc/postfix/master.cf: submission inet .... smtpd -o smtpd_xxx_yyy=$submission_xxx_yyy /etc/postfix/main.cf submission_xxx_yyy = text with whitespace... NOTE 3: Over-zealous use of parameter overrides makes the Postfix configuration hard to understand and maintain. At a certain point, it might be easier to configure mul- tiple instances of Postfix, instead of configuring multi- ple personalities via master.cf. Since the "-o" options are *overrides*, if an option has the right value in main.cf, there is no need for an override. The only practical exception that comes to mind is that the smtpd_mumble_restrictions (for various values of "mumble") should have defensive overrides in the submission entry of master.cf (setting most of them empty). This is because the submission restrictions almost never match the inbound SMTP restrictions and once set rarely need any changes, and it would be too easy to break the former while making changes to the latter. -- Viktor.
