The deferred messages are journaling emails not yet processed by the Archiver. When an emails ends up in the deferred queue, there is no listener capable of Archiving the email. In this case you have to check the headers X-Archiver-Sender-Domain and X-Archiver-Sender-Addr. Specifically:
- the X-Archiver-Sender-Domain header contains the domain from which the journaling emails are coming
- the X-Archiver-Sender-Addr header contains the IP address from which the journaling emails are coming
At least one among domain and IP address must be configured in one of the listeners of the tenant you want to assign the email to.
From this page is possible to:
- view the raw header of a deferred email
- manually launch the reprocess of a deferred email
- delete a deferred email
- reprocess all the deferred emails for all the tenants
NOTE: reprocessing all the deferred emails could take a lot of time if there are a lot of deferred emails.