Editing Introduction to a Self Managed Life: a 13 hour & 28 minute presentation by FUTO software (section)

==== 1.2 Configure Main Postfix Configuration - this is similar to what we did for FreePBX voicemail alerts in the previous section ====

<ol style="list-style-type: decimal;">
<li><p>Backup existing configuration:</p>
<pre>sudo cp /etc/postfix/main.cf /etc/postfix/main.cf.backup</pre></li>
<li><p>Create new <code>main.cf</code>:</p>
<pre>sudo nano /etc/postfix/main.cf</pre></li>
<li><p>Copy and paste the provided configuration template if you need, and edit the <code>yourdriveisdead@stevesavers.com</code> email in the configuration file with the email you wish to have Postfix use to send you an email.</p></li></ol>

<pre>  # See /usr/share/postfix/main.cf.dist for a commented, more complete version
  
  
  # Debian specific:  Specifying a file name will cause the first
  # line of that file to be used as the name.  The Debian default
  # is /etc/mailname.
  #myorigin = /etc/mailname
  
  smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
  biff = no
  
  # appending .domain is the MUA's job.
  append_dot_mydomain = no
  
  # Uncomment the next line to generate &quot;delayed mail&quot; warnings
  #delay_warning_time = 4h
  
  readme_directory = no
  
  # See http://www.postfix.org/COMPATIBILITY_README.html -- default to 3.6 on
  # fresh installs.
  compatibility_level = 3.6
  
  
  
  # TLS parameters
  smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
  smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
  smtpd_tls_security_level=may
  
  smtp_tls_CApath=/etc/ssl/certs
  smtp_tls_security_level=may
  smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
  
  
  smtpd_relay_restrictions = permit_mynetworks 
  permit_sasl_authenticated defer_unauth_destination
  myhostname = debian.home.arpa
  alias_maps = hash:/etc/aliases
  alias_database = hash:/etc/aliases
  mydestination = $myhostname, debian, localhost.localdomain, localhost
  relayhost = [smtp.postmarkapp.com]:587
  smtp_use_tls = yes
  smtp_sasl_auth_enable = yes
  smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
  smtp_sasl_security_options = noanonymous
  smtp_sasl_mechanism_filter = plain
  sender_canonical_maps = static:yourdriveisdead@stevesavers.com
  mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
  mailbox_size_limit = 0
  recipient_delimiter = +
  # WARNING: Changing the inet_interfaces to an IP other than 127.0.0.1 may expose Postfix to external network connections.
  # Only modify this setting if you understand the implications and have specific network requirements.
  inet_interfaces = 127.0.0.1
  inet_protocols = all
  message_size_limit = 102400000</pre>
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