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sudo apt-get update
sudo apt-get install postfix dovecot-core dovecot-imapd dovecot-pop3d

sudo nano /etc/postfix/main.cf

# 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 (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_use_tls=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.

smtpd_relay_restrictions = permit_mynetworks permit_sasl_authenticated defer_unauth_destination
myhostname = example.com
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = example.com, localhost.localdomain, localhost
relayhost =
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mailbox_size_limit = 0

# Dovecot SASL
smtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous

# Virtual mailbox settings
virtual_mailbox_domains = example.com
virtual_mailbox_base = /var/mail/virtual
virtual_mailbox_maps = hash:/etc/postfix/virtual_mailbox
virtual_minimum_uid = 1000
virtual_uid_maps = static:1000
virtual_gid_maps = static:1000

# SMTP authentication
smtpd_recipient_restrictions = permit_sasl_authenticated, permit_mynetworks, reject_unauth_destination
smtpd_sender_restrictions = permit_sasl_authenticated, permit_mynetworks
smtpd_sasl_local_domain = $myhostname
smtpd_sasl_security_options = noanonymous
broken_sasl_auth_clients = yes

# TLS settings
smtpd_tls_security_level = may
smtpd_tls_auth_only = yes
smtp_tls_security_level = may
smtp_tls_note_starttls_offer = yes
smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt

# Postfix restrictions
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_mynetworks, reject_non_fqdn_hostname, reject_invalid_hostname
smtpd_sender_restrictions = permit_mynetworks, reject_non_fqdn_sender, reject_unknown_sender_domain
smtpd_recipient_restrictions = permit_mynetworks, reject_non_fqdn_recipient, reject_unknown_recipient_domain, reject_unauth_destination

sudo apt-get install dovecot-core dovecot-imapd dovecot-pop3d

# Protocols we want to be serving.
# Protocols are enabled by adding the protocol name(s) as a comma-separated
# list of environment variables to /etc/default/dovecot.
protocols = imap pop3 lmtp

# Disable SSLv3 and use only TLSv1.2 and above
ssl_protocols = !SSLv3 !SSLv2 !TLSv1 !TLSv1.1
ssl_cipher_list = AES128+EECDH:AES128+EDH

# Set Dovecot to use the Maildir format for storing mail.
mail_location = maildir:/var/mail/virtual/%d/%n

# Set the login user to be the virtual user created in Postfix.
auth_username_format = %n

# Tell Dovecot to use the same authentication mechanism as Postfix.
auth_mechanisms = plain login

# Set the location of the password file.
passdb {
  driver = passwd-file
  args = scheme=SHA512 /etc/dovecot/users
}

# Tell Dovecot where to find the user information.
userdb {
  driver = static
  args = uid=1000 gid=1000 home=/var/mail/virtual/%d/%n
}

sudo nano /etc/dovecot/users

username:{PLAIN}password

johndoe@example.com:{SHA512}gjKt1cnwHf+8BZSUL27P/zTtJJnOsdpDTc8yL/rpE1JPPOjKwBU2QY8Z1Fbh07X62fZ45dD0L3g4+kDyIWRtQw==

sudo systemctl restart dovecot

sudo systemctl status dovecot

Copy codesudo ufw allow smtp
sudo ufw allow imap
sudo ufw allow pop3

bashCopy codeecho "This is a test email" | mail -s "Test Email" johndoe@example.com