Transfer modules (such as SMTP, Local Delivery, LIST, and PIPE) maintain one or several queues for messages to be delivered. Each Module uses its own methods to build the queues (for example, the SMTP Module usually builds a separate queue for each remote domain to deliver to, while the Local Delivery Module builds a separate queue for each local Account), see the manual section describing the Module for more details.
To open a Module queue, click the queue name link on Module Monitor page. The Module ("host") queue page opens:
The table header contains the information about the entire queue ("host"):
Module: The link to the Monitor page of the Transfer Module this queue belongs to.
Last Error: This field indicates the last queue-wide transfer operation error.
The table contains a record for each message in the queue. For each enqueued message, the following information fields are displayed:
Message: The message internal ID. You can use this link to open the Message Monitor page.
In Queue: The time the message has spent in this queue.
Return Path: The message envelope "Return-Path" address.
Recipients: The number of message addresses that should be delivered to the "host" this queue is created for. For example, a message directed to email@example.com and firstname.lastname@example.org addresses via SMTP will appear once in the company.dom SMTP queue, with the indicated number of addresses being 2.
Size: The message size.
Delayed and Last Error: If delivery failed for this particular message, the Transfer Module could delay this message individually (rather than delaying the entire queue). In this case, this field will show the time when the Module will try to deliver the message again, and the Last Error field will show the information about the cause of the transfer operation failure.
If you have the Can Release Queues access right, and the Queue has the Delayed status, the Host Queue Monitor page