mail/config.example.toml at main · mail-os/mail · GitHub

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# SMTP Server Configuration
# Copy this file to config.toml and customize for your environment
#
# Configuration priority (highest to lowest):
# 1. Command-line arguments
# 2. Environment variables (SMTP_*)
# 3. Configuration file (this file)
# 4. Profile defaults (set via SMTP_PROFILE env var)

[server]
# Network binding
host = "0.0.0.0"
port = 2525
hostname = "mail.example.com"

# Connection limits
max_connections = 1000
max_message_size = 26214400  # 25MB
max_recipients = 100

[timeouts]
# All values in seconds
connection = 300       # General connection timeout
data = 600            # DATA command timeout (needs longer for large emails)
command = 60          # Timeout between commands
greeting = 30         # Timeout for initial greeting

[tls]
enabled = false
cert_path = "/etc/ssl/certs/mail.pem"
key_path = "/etc/ssl/private/mail.key"

[auth]
enabled = true

[rate_limit]
per_ip = 100          # Requests per hour per IP
per_user = 500        # Requests per hour per authenticated user
cleanup_interval = 3600  # Cleanup interval in seconds

[webhook]
enabled = false
url = "https://your-webhook-endpoint.com/email"

[antispam]
dnsbl = false         # DNS-based blacklist checking
greylist = false      # Greylisting for spam prevention

[observability]
tracing = false                    # OpenTelemetry tracing
service_name = "mail"              # Service name for traces
json_logging = false               # JSON format for log output

[dkim]
rotation_enabled = false
rotation_interval_days = 90

[sieve]
enabled = false

[dane]
enabled = false

[mta_sts]
enabled = false

[acme]
enabled = false
email = ""

[tls_rpt]
enabled = false

[arc]
enabled = false

[bimi]
enabled = false

[list_unsubscribe]
enabled = false
url_base = "https://mail.example.com/unsubscribe"

[autoconfig]
enabled = false

[managesieve]
enabled = false
port = 4190

[milter]
enabled = false

# Profile-specific overrides can be set via environment:
# SMTP_PROFILE=production  (uses production defaults)
# SMTP_PROFILE=development (uses development defaults)
# SMTP_PROFILE=testing (uses testing defaults)