Postfix/fixing

How to

Find where the config files are:
- postconf <setting_name>, where <setting_name> is one of the following:
  - alias_database filespec for the main alias database ("hash:" just means a text file)
  - alias_maps seems to be the same thing?
  - config_directory: main folder where config files are stored (typically /etc/postfix)
  - mydomain: not sure what this specifically does, but it seems significant
  - myhostname: internet domain name for the server
  - myorigin: I think this sets the "from" address in outgoing mail (typically /etc/mailname)
  - virtual_alias_maps: alias maps for virtual domains, same format as alias_maps (typically hash:/etc/postfix/virtual)
- postconf -n will show any settings which have been changed from their defaults
- postconf will show a (long) list of all settings, which can either be dumped to a file for searching or viewed in a scrollable way with postconf | less