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johndoe6345789
f6e13992c3
Implementation of Phase 8 Email Client backend infrastructure: - Alpine Linux base image for minimal footprint (~25 MB) - Postfix SMTP server with relay and submission modes - Dovecot POP3/IMAP integration for mailbox access - TLS/SSL encryption (STARTTLS and implicit TLS) - SASL authentication via Dovecot socket - Multi-port support: SMTP (25, 587, 465), POP3 (110, 995), IMAP (143, 993) - Dynamic configuration via environment variables - Health check script for container orchestration - Persistent volume support for mail spool and configuration Files created: - deployment/docker/postfix/Dockerfile: Alpine-based image with auto-config - deployment/docker/postfix/main.cf: Comprehensive Postfix configuration (70+ params) - deployment/docker/postfix/master.cf: Process table with service definitions - deployment/docker/postfix/README.md: Complete operator documentation - txt/PHASE_8_POSTFIX_SMTP_COMPLETION_2026-01-24.txt: Summary and checklist Integration: - Ready for docker-compose integration with Phase 7 Python email service - Supports Docker networks for secure container-to-container communication - Configured for relay from Python email app (port 25) - Supports authenticated client submission (port 587) - Default test accounts for development: admin, relay, user Phase 8 Status: COMPLETE - Postfix SMTP backend infrastructure ready - All 4 files created and tested - Documentation complete - Ready for integration testing with Phase 7 See deployment/docker/postfix/README.md for full documentation. Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
276 lines
8.9 KiB
CFEngine3
276 lines
8.9 KiB
CFEngine3
# Postfix Main Configuration - MetaBuilder Email Client Phase 8
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# This file is the primary Postfix configuration file
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# Reference: http://www.postfix.org/postconf.5.html
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# ============================================================================
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# BASIC SETTINGS
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# ============================================================================
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# The internet hostname of this mail system
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# (Default: system FQDN)
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myhostname = postfix.metabuilder.local
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# The internet domain name of this mail system
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# Used for unqualified addresses
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mydomain = metabuilder.local
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# The domain name that locally-posted mail appears to come from
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myorigin = $mydomain
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# The list of domains that this mail system considers local
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mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
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# Network interfaces that Postfix listens on
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inet_interfaces = all
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# IP protocols to use for SMTP connections
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inet_protocols = ipv4
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# ============================================================================
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# NETWORK & RELAY SETTINGS
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# ============================================================================
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# List of trusted networks for mail relay (via SMTP)
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# - 127.0.0.1/8: localhost (always trusted)
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# - 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16: Docker networks
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mynetworks = 127.0.0.1/8, 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16
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# List of hosts/domains to relay mail through
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# Empty by default - set via environment variable for external relay
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# Example: relayhost = gmail-smtp-in.l.google.com:587
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relayhost =
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# Address preference for outbound SMTP connections
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smtp_address_preference = ipv4
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# ============================================================================
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# SASL AUTHENTICATION (Relay & Dovecot Integration)
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# ============================================================================
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# Enable SASL authentication for incoming SMTP connections
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smtpd_sasl_auth_enable = yes
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# SASL authentication type (dovecot for Dovecot integration)
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smtpd_sasl_type = dovecot
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# Path to Dovecot auth socket (relative to Postfix spool directory)
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smtpd_sasl_path = private/auth
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# Local domain for SASL authentication
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smtpd_sasl_local_domain = $mydomain
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# SASL authentication options (noanonymous = require login)
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smtpd_sasl_security_options = noanonymous
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# ============================================================================
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# SMTPD RESTRICTIONS (Inbound SMTP Policy)
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# ============================================================================
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# SMTP client connection restrictions
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smtpd_client_restrictions =
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permit_mynetworks,
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permit_sasl_authenticated,
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reject_unauth_pipelining,
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permit
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# SMTP helo restrictions
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smtpd_helo_restrictions =
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permit_mynetworks,
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permit_sasl_authenticated,
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reject_invalid_helo_hostname,
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reject_non_fqdn_helo_hostname,
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permit
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# SMTP sender restrictions (envelope sender)
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smtpd_sender_restrictions =
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permit_mynetworks,
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permit_sasl_authenticated,
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reject_non_fqdn_sender,
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permit
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# SMTP recipient restrictions (prevent open relay)
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smtpd_recipient_restrictions =
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permit_mynetworks,
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permit_sasl_authenticated,
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reject_unauth_destination,
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permit
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# Relay policy (determines who can relay mail through us)
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smtpd_relay_restrictions =
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permit_mynetworks,
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permit_sasl_authenticated,
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defer_unauth_destination
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# ============================================================================
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# OUTBOUND SMTP SETTINGS (Relay Configuration)
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# ============================================================================
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# SMTP client authentication for relay
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smtp_sasl_auth_enable = no
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smtp_sasl_password_maps =
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smtp_sasl_security_options = noanonymous
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# SMTP client TLS security level for relay
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smtp_tls_security_level = may
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smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
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# ============================================================================
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# TLS/SSL SETTINGS (Security & Encryption)
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# ============================================================================
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# Inbound SMTP TLS settings
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smtpd_tls_security_level = may
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smtpd_tls_cert_file = /etc/dovecot/certs/dovecot.crt
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smtpd_tls_key_file = /etc/dovecot/certs/dovecot.key
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smtpd_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
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# Outbound SMTP TLS settings
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smtp_tls_security_level = may
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smtp_tls_CAfile = /etc/ssl/certs/ca-certificates.crt
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# TLS cipher settings (strong ciphers only)
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smtpd_tls_ciphers = high
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smtpd_tls_exclude_ciphers = aNULL, eNULL, EXPORT, DES, RC4, MD5, PSK, SRP, aSS
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# Enable/disable TLS session caching
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smtpd_tls_session_cache_database = btree:/var/lib/postfix/smtpd_tls_session_cache
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smtp_tls_session_cache_database = btree:/var/lib/postfix/smtp_tls_session_cache
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# ============================================================================
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# MESSAGE SIZE & DELIVERY LIMITS
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# ============================================================================
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# Maximum message size (bytes) - 50 MB default
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message_size_limit = 52428800
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# Maximum size of a mailbox (0 = unlimited)
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mailbox_size_limit = 0
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# Postfix bounce notice content size limit
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bounce_size_limit = 50000
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# Rate limiting
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default_process_limit = 100
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default_transport_rate_limit = 0
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default_destination_rate_limit = 0
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# Connection rate limiting
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default_delivery_slot_cost = 5
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default_delivery_slot_discount = 50
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# ============================================================================
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# LOCAL DELIVERY SETTINGS
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# ============================================================================
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# Program to deliver mail to local mailbox
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mailbox_command = /usr/lib/dovecot/deliver -d %u
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# Use Dovecot for local deliveries
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virtual_transport = dovecot
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dovecot_destination_recipient_limit = 1
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# Virtual mailbox (if using virtual domains)
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# virtual_mailbox_base = /var/mail/vhosts
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# virtual_mailbox_domains = $virtual_mailbox_maps
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# ============================================================================
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# ALIAS SETTINGS
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# ============================================================================
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# File containing local aliases
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alias_maps = hash:/etc/postfix/aliases
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alias_database = hash:/etc/postfix/aliases
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# Virtual alias maps (if using virtual domains)
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# virtual_alias_maps = hash:/etc/postfix/virtual_aliases
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# ============================================================================
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# ADDRESS VERIFICATION
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# ============================================================================
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# Enable address verification to reduce bounce mail
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address_verify_negative_cache = yes
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address_verify_negative_expire = 3d
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# Verify recipient addresses
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unverified_recipient_reject_codes = 450, 550
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unverified_sender_reject_codes = 450, 550
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# ============================================================================
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# LOGGING & DEBUGGING
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# ============================================================================
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# Debug level (0-4, higher = more verbose)
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debug_peer_level = 2
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# Log all mail transactions (verbose)
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# debug = yes
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# ============================================================================
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# QUEUE & BOUNCE SETTINGS
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# ============================================================================
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# How long to keep messages in the queue
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maximal_queue_lifetime = 5d
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# How long to keep bounce messages
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bounce_queue_lifetime = 5d
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# Notification settings for delivery delays
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delay_warning_time = 4h
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# ============================================================================
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# PERFORMANCE TUNING
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# ============================================================================
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# Number of delivery processes
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default_process_limit = 100
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# Maximum number of messages in active queue
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qmgr_message_recipient_limit = 20000
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# Scheduler tuning
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qmgr_default_delivery_slot_cost = 5
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qmgr_default_delivery_slot_discount = 50
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# Enable fast FLUSH support
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flush_service_name = flush
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# ============================================================================
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# MISCELLANEOUS
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# ============================================================================
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# Compatibility mode
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compatibility_level = 3.8
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# System mail recipient for policy violations
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policy_time_limit = 3600s
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# Enable null sender bounce addresses (DSN)
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bounce_notice_recipient = postmaster
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# Postfix daemon binding address (0.0.0.0 = all interfaces)
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smtp_bind_address = 0.0.0.0
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# SMTP client hostname lookup
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smtp_host_lookup = dns
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# ============================================================================
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# CONTENT FILTERING (Optional - can be enabled later)
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# ============================================================================
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# Uncomment to enable content filtering via external scripts
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# receive_override_options = no_address_mappings
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# content_filter = smtp-amavis:[127.0.0.1]:10024
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# ============================================================================
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# RATE LIMITING & ANTI-SPAM
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# ============================================================================
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# Limit concurrent connections from single client
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smtpd_client_connection_count_limit = 10
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smtpd_client_connection_rate_limit = 100
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# Per-domain connection limits
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smtpd_per_record_limit = 10000
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