The "Bounce size limit" option limits the amount of original message context in bytes that is sent in a non-delivery notification. This option sets the "bounce_size_limit" postfix variable.
The "Command time limit" option limits the amount of time for delivery to external commands. This limit is used by the local delivery agent, and is the default time limit for delivery by the pipe mailer. This option sets the "command_time_limit" postfix variable.
Note: if you set this time limit to a large value you must update the global "Ipc timeout" option as well.
The "Default process limit" option specifies the default limit on the number of Postfix child processes that provide a given service. This option sets the "default_process_limit" postfix variable.
The "Deliver loack attempts" option limits the number of attempts to acquire an exclusive lock on a mailbox or other file. This option sets the "deliver_lock_attempts" postfix variable.
The "Deliver lock delay" option limits the time in seconds between attempts to acquire an exclusive lock. This option sets the "deliver_lock_delay" postfix variable.
The "Duplicate filter limit" option limits the number of addresses remembered by the duplicate filter for alias, virtual, etc. expansion. This option sets the "duplicate_filter_limit" postfix variable.
The "Fork attempts" option limits the number of attempts to fork() a process. This option sets the "fork_attemps" postfix variable.
The "Fork delay" option specifies the delay in seconds between fork() attempts. This option sets the "fork_delay postfix variable.
The "Header size limit" option limits the amount of memory in bytes used for processing a message header. If a header is larger, the remainder of the entire message is treated as message body. This option sets the "header_size_limit" postfix variable.
The "Line length limit" option limits the amount of memory in bytes used for handling input lines. Longer lines are chopped up into pieces and reconstructed upon delivery. This option sets the "line_length_limit" postfix variable.
The "Message size limit" option limits the total size in bytes of a message, including envelope information. This option sets the "message_size_limit" postfix variable.
The "qmgr message active limit" option limits the number of messages in the active queue. This option sets the "qmgr_message_active_limit" postfix variable.
The "qmgr message recipient limit" option limits the number of in-memory recipients. This option also limits the size of the short-term, in-memory destination status cache. This option sets the "qmgr_message_recipient_limit" postfix variable.
The "Queue minfree" option specifies the minimal amount of free space in bytes in the queue file system. This is currently used by the SMTP server to decide if it will accept any mail at all. This option sets the "queue_minfree" postfix variable.
The "Stale lock time" option limits the time after which a stale lock is removed. This is used for delivery to file or mailbox. This option sets the "stale_lock_time" postfix variable.
The "Transport retry time" option specifies the time in seconds between attempts by the queue manager to contact a broken message delivery transport. This option sets the "transport_retry_time" postfix variable.