config

var Keys = []Key{
	{Name: "hostname", Help: "Mail host name: MX target, HELO name and PTR of the server (e.g. mail.example.com).", Check: isHost},
	{Name: "ipv4", Check: isIP(4), Help: "Public IPv4 address of the server, used in DNS records."},
	{Name: "ipv6", Check: isIP(6), Help: "Public IPv6 address of the server, used in DNS records when set."},
	{Name: "acme.email", Help: "Contact address for Let's Encrypt (expiry notices)."},
	{Name: "acme.directory", Default: "https://acme-v02.api.letsencrypt.org/directory", Help: "ACME directory URL."},
	{Name: "mta_sts.mode", Default: "testing", Check: oneOf("testing", "enforce"), Help: "MTA-STS mode published for every domain: testing only asks senders for TLS reports; enforce makes them refuse to deliver without valid TLS. Switch once lfr reports shows clean TLS reports for a few weeks."},
	{Name: "relay.url", Help: "Outbound relay, e.g. smtps://user@email-smtp.eu-central-1.amazonaws.com:2465 or smtp://user@mail.smtp2go.com:2525 (STARTTLS). Empty: deliver directly to recipients' MX on port 25."},
	{Name: "relay.password", Secret: true, Help: "Password for the relay user."},
	{Name: "relay.spf", Help: "SPF mechanism of the relay, e.g. include:amazonses.com; added to every domain's SPF record."},
	{Name: "relay.sns_topic", Help: "Amazon SNS topic whose notifications the ses webhook accepts; set by the first confirmed subscription. Clear it to subscribe a new topic."},
	{Name: "relay.rate", Default: "10", Check: isInt(1, 1000), Help: "Maximum messages per second handed to the relay or sent directly."},
	{Name: "relay.connections", Default: "2", Check: isInt(1, 16), Help: "Parallel outbound connections."},
	{Name: "smtp.max_size", Default: "20971520", Check: isInt(1<<20, 1<<30), Help: "Largest accepted inbound message in bytes."},
	{Name: "smtp.max_conns", Default: "50", Check: isInt(1, 10000), Help: "Concurrent inbound SMTP connections."},
	{Name: "smtp.max_conns_per_ip", Default: "5", Check: isInt(1, 1000), Help: "Concurrent inbound SMTP connections per IP address."},
	{Name: "smtp.rate_per_ip", Default: "30", Check: isInt(1, 100000), Help: "Inbound SMTP connections per IP address per hour."},
	{Name: "smtp.early_talker", Default: "true", Check: isBool, Help: "Drop clients that talk before the greeting (a strong spambot signal); delays each connection by 0.5 s."},
	{Name: "spam.dnsbl", Default: "zen.spamhaus.org,bl.spamcop.net,psbl.surriel.com", Help: "DNS blocklists for connecting IPs, comma separated. Spamhaus needs a DQS key when your resolver is a large public one (use <key>.zen.dq.spamhaus.net)."},
	{Name: "spam.junk", Default: "0.6", Check: isFraction, Help: "Spam probability from which mail goes to junk."},
	{Name: "spam.reject", Default: "0.98", Check: isFraction, Help: "Spam probability from which mail is refused during SMTP."},
	{Name: "web.signup_per_ip", Default: "10", Check: isInt(1, 100000), Help: "Signups accepted per IP address per hour."},
	{Name: "web.confirm_per_list", Default: "200", Check: isInt(1, 1000000), Help: "Confirmation mails per list per hour; protects against list bombing."},
	{Name: "retention.trash_days", Default: "30", Check: isInt(1, 3650), Help: "Days before trash is purged."},
	{Name: "retention.junk_days", Default: "30", Check: isInt(1, 3650), Help: "Days before junk is purged."},
	{Name: "retention.events_days", Default: "400", Check: isInt(30, 36500), Help: "Days opens, clicks and delivery events are kept."},
}