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• General type of mail configuration: Internet Site
• NONE doesn't appear to be requested in current config
• System mail name: server1.example.com
• Root and postmaster mail recipient: 
• Other destinations for mail: server1.example.com, example.com, localhost.example.com, localhost
• Force synchronous updates on mail queue?: No
• Local networks: 127.0.0.0/8
• Yes doesn't appear to be requested in current config
• Mailbox size limit (bytes): 0
• Local address extension character: +
• Internet protocols to use: all

• sudo postconf -e 'home_mailbox = Maildir/'
• sudo postconf -e 'mailbox_command ='
• sudo postconf -e 'smtpd_sasl_local_domain ='
• sudo postconf -e 'smtpd_sasl_auth_enable = yes'
• sudo postconf -e 'smtpd_sasl_security_options = noanonymous'
• sudo postconf -e 'broken_sasl_auth_clients = yes'
• sudo postconf -e 'smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination'
• sudo postconf -e 'inet_interfaces = all'

• touch smtpd.key
• chmod 600 smtpd.key
• openssl genrsa 1024 > smtpd.key
• openssl req -new -key smtpd.key -x509 -days 3650 -out smtpd.crt # has prompts
• openssl req -new -x509 -extensions v3_ca -keyout cakey.pem -out cacert.pem -days 3650 # has prompts
• sudo mv smtpd.key /etc/ssl/private/
• sudo mv smtpd.crt /etc/ssl/certs/
• sudo mv cakey.pem /etc/ssl/private/
• sudo mv cacert.pem /etc/ssl/certs/

• sudo postconf -e 'smtp_tls_security_level = may'
• sudo postconf -e 'smtpd_tls_security_level = may'
• sudo postconf -e 'smtpd_tls_auth_only = no'
• sudo postconf -e 'smtp_tls_note_starttls_offer = yes'
• sudo postconf -e 'smtpd_tls_key_file = /etc/ssl/private/smtpd.key'
• sudo postconf -e 'smtpd_tls_cert_file = /etc/ssl/certs/smtpd.crt'
• sudo postconf -e 'smtpd_tls_CAfile = /etc/ssl/certs/cacert.pem'
• sudo postconf -e 'smtpd_tls_loglevel = 1'
• sudo postconf -e 'smtpd_tls_received_header = yes'
• sudo postconf -e 'smtpd_tls_session_cache_timeout = 3600s'
• sudo postconf -e 'tls_random_source = dev:/dev/urandom'
• sudo postconf -e 'myhostname = server1.example.com' # remember to change this to yours

# See /usr/share/postfix/main.cf.dist for a commented, more complete version

smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu)

biff = no

# appending .domain is the MUA's job.

append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings

#delay_warning_time = 4h

myhostname = server1.example.com

alias_maps = hash:/etc/aliases

alias_database = hash:/etc/aliases

myorigin = /etc/mailname

mydestination = server1.example.com, example.com, localhost.example.com, localhost

relayhost =

mynetworks = 127.0.0.0/8

mailbox_command = procmail -a "$EXTENSION"

mailbox_size_limit = 0

recipient_delimiter = +

inet_interfaces = all

smtpd_sasl_local_domain =

smtpd_sasl_auth_enable = yes

smtpd_sasl_security_options = noanonymous

broken_sasl_auth_clients = yes

smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination

smtpd_tls_auth_only = no

#Use these on Postfix 2.2.x only

#smtp_use_tls = yes

#smtpd_use_tls = yes

#For Postfix 2.3 or above use:

smtp_tls_security_level = may

smtpd_tls_security_level = may

smtp_tls_note_starttls_offer = yes

smtpd_tls_key_file = /etc/ssl/private/smtpd.key

smtpd_tls_cert_file = /etc/ssl/certs/smtpd.crt

smtpd_tls_CAfile = /etc/ssl/certs/cacert.pem

smtpd_tls_loglevel = 1

smtpd_tls_received_header = yes

smtpd_tls_session_cache_timeout = 3600s

tls_random_source = dev:/dev/urandom