This folder stores persistent application data like unprocessable emails, and must be shared in cluster setups to be available for all nodes.

Possible subfolders (depending on system configuration and usage):

• var/spool/unprocessable_mail - stores emails that could not properly be imported

Just for reference, Zammad 6.1 and earlier did also store here:

• var/spool/oversized_mail - emails that were rejected as too big