Artica Wiki

Display and manage the SMTP queue

When a message needs to be processed, it is saved in a buffer zone on disk, called a queue.

Usually, very few messages are kept in the queue, as they only need to pass through and are instantly forwarded to the recipient's mail server.

You have 2 main email queues: pending mails and deferred mails. 
Deferred mails are messages that have been soft-failed and are being put on hold to try to be sent later. 
Their status is Temporary failure. 
By default, the SMTP service tries 5 minutes later.

Artica scan perdiodically the queue each 5 minutes in order to let you read the queue from this section.