MtaQueueHostVariable

Variables available in expression contexts that reference MtaQueueHostVariable.

Variable	Description
sender	Envelope sender (return path), empty for bounces
sender_domain	Domain of the envelope sender, empty for bounces
rcpt_domain	Domain of the recipient
rcpt	Recipient address; the domain is lowercase, the local part keeps its case
recipients	List of all recipient addresses of the message
mx	MX host currently being tried, empty until one is selected
priority	Message priority (number, from -9 to 9, 0 when not set)
remote_ip	IP address of the remote server for the current attempt, 0.0.0.0 until one is selected
local_ip	Local IP address used for the current attempt, 0.0.0.0 when none is chosen
retry_num	Number of delivery attempts made so far for the recipient
notify_num	Number of delay notifications sent so far for the recipient
expires_in	Seconds until the message expires, or remaining attempts when expiry is set by attempt count; 0 once expired
last_status	Delivery status of the recipient: Scheduled, Delivered, Temporary Failure or Permanent Failure, followed by details
last_error	Type of the last error: none, dns, unexpected-reply, connection, tls, dane, mta-sts, rate, concurrency or io
queue_name	Name of the queue holding the message
queue_age	Seconds since the message entered the queue
received_from_ip	IP address the message was received from
received_via_port	Local port the message was received on (number)
source	How the message entered the queue: authenticated, dmarc_pass, unauthenticated, dsn, report, autogenerated or unknown
size	Message size in bytes