X-Warn-Attachment		| attach		| attachment with double extensions
X-Warn-Boundary			| boundary		| broken MIME container found
X-Warn-Compat			| compat		| sender/recipient addresses blacklisted
X-Warn-Compat-Relay		| compat-relay		| sender host address and sender/recipient addresses blacklisted
X-Warn-DNSBL			| dnsbl			| sender host address is in DNSBL
X-Warn-HELO-Blacklisted		| helo-blacklisted	| helo blacklisted
X-Warn-HELO-Forged		| helo-forged		| helo is forged
X-Warn-HELO-Own			| helo-own		| helo used my own credentials
X-Warn-Internal			| fake-internal		| this looks like a fake internal message
X-Warn-Local			| fake-local		| this looks like a fake local message
X-Warn-MIME			| mime			| mime error(s) detected
X-Warn-Mail-A			| bad-sender-domain-a	| sender domain has bad A record
X-Warn-Mail-MX			| bad-sender-domain-mx	| sender domain has bad MX record
X-Warn-Mail-NS			| sender-domain-ns	| sender domain has suspicious NS record
X-Warn-Mail-SPF			| bad-sender-domain-spf	| sender domain has bad SPF record
X-Warn-Mail-TXT			| bad-sender-domain-txt	| sender domain has bad TXT record
X-Warn-Message-Id		| message-id		| Message-Id field is missed
X-Warn-Recipient		| recipient		| recipient address blacklisted
X-Warn-Relay-BlackListed	| relay-blacklisted	| relay blacklisted
X-Warn-Relay-OS			| relay-os		| relay OS detected
X-Warn-Resolve			| resolve		| resolve
X-Warn-SMTP-Command-MAIL	| smtp-command-mail	| smtp command MAIL syntax error
X-Warn-SMTP-Command-RCPT	| smtp-command-rcpt	| smtp command RCPT syntax error
X-Warn-SPF			| spf			| \$sender_host_address is not allowed to send mail from \$sender_address_domain
X-Warn-Sender			| sender		| sender address blacklisted
X-Warn-Sender-Verify		| sender-verify		| sender verify failed or deffered
X-Warn-Rate			| rate			| ratelimit exceeds