All QAnywhere messages support the same set of header fields. Header fields contain values that are used by both clients and providers to identify and route messages. How you use the headers depends on the type of client application you have.

QAnywhere supports the following pre-defined message headers:

• Message ID
• Message creation timestamp
• Reply-to address
• Message address
• Redelivered state of message
• Expiration of message
• Priority of message
• Message ID of a message for which this message is a reply

For detailed information about message headers, see Message headers.