During Postfix installation I configured General type of mail configuration.
How check this configuration after intallation?
21 Answer
While the default install and config will often end up in what was considered a "working system" 15+ years ago, to actually run an Internet connected mail server today requires a little more diligence and set up.
You'll want to ensure that you do not have an open relay, that you have SPF and/or DKIM records that are properly configured, proper MX entries in your DNS, probably SSL certs for ESMTP, etc. Without all of this, you'll either end up being a source of spam and having your IP/domain black listed, or at the very least you'll have problems not being flagged as junk by gmail et al.
You may want to run your domain through and see what results you get.
Per your comment if you just want to see the final configuration you can look at the /etc/postfix/main.cf and /etc/postfix/master.cf files, or run the postconf -n command (which kinda merges the 2 files and shows complete active config)
