Main.cf

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

readme_directory = no

# 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_cert_file=/etc/nginx/ssl/myserver_mail.crt
#smtpd_tls_key_file=/etc/nginx/ssl/myserver_mail.key
#smtpd_tls_CAfile =/etc/nginx/ssl/ca.crt
smtp_tls_cert_file=/etc/mail/ssl/certs/certificate.crt
smtp_tls_key_file=/etc/mail/ssl/certs/myserver.com.key
smtpd_tls_CApath=/etc/ssl/certs
smtp_tls_CApath=/etc/ssl/certs
smtp_tls_CAfile=/etc/mail/ssl/certs/myserver.com.ca-bundle

smtpd_tls_cert_file=/etc/mail/ssl/certs/certificate.crt
smtpd_tls_key_file=/etc/mail/ssl/certs/myserver.com.key
smtpd_tls_CAfile=/etc/mail/ssl/certs/myserver.com.ca-bundle
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = static:info@myserver.com:password
smtp_sasl_security_options = noanonymous

smtpd_tls_loglevel = 3
smtpd_tls_received_header = yes
smtpd_tls_session_cache_timeout = 3600s
tls_random_source = dev:/dev/urandom
smtp_use_tls=yes
smtpd_use_tls=yes
#smtp_enforce_tls=yes
smtp_tls_security_level=encrypt
header_size_limit = 4096000
# Seriously - for email relaying, just get a $5 Linode and install Ubuntu + iRedmail. Works out of the box and supports relaying,
# webmails etc (Roundcube, SoGo WorkGroup). The mx.mysmtpserver.com:587 is using iRedmail.
relayhost = mx.mysmtpserver.com:587
smtpd_tls_auth_only=yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
# information on enabling SSL in the smtp client.


smtp_tls_mandatory_exclude_ciphers = aNULL, eNULL, EXPORT, DES, RC4, MD5, PSK, aECDH, EDH-DSS-DES-CBC3-SHA, EDH-RSA-DES-CDC3-SHA, KRB5-DE5, CBC3-SHA
smtpd_tls_mandatory_exclude_ciphers = aNULL, eNULL, EXPORT, DES, RC4, MD5, PSK, aECDH, EDH-DSS-DES-CBC3-SHA, EDH-RSA-DES-CDC3-SHA, KRB5-DE5, CBC3-SHA
smtpd_tls_dh512_param_file = /etc/ssl/private/dhparams512.pem
smtpd_tls_dh1024_param_file = /etc/ssl/private/dhparams1024.pem
smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination

# DKIM
# --------------------------------------
milter_default_action = accept
milter_protocol = 2
smtpd_milters = inet:localhost:8891
non_smtpd_milters = inet:localhost:8891

mydomain = myserver.com
myhostname = myserver.com
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
## If here's host destination, it'll bounce all the mails that are not mapped in virtual aliases (like blaa@blaa.com)
mydestination =
# localhost $myhostname, myserver.com, localhost
#relayhost =
mynetworks = 127.0.0.0/8
#[::ffff:127.0.0.0]/104 [::1]/128
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
inet_protocols = ipv4
virtual_alias_maps = hash:/etc/postfix/virtual
canonical_maps = hash:/etc/postfix/canonical