What can proxymap be used for in a Postfix installation? (Select TWO correct answers)

Proxymap allows the Postfix lookup client to query a single lookup proxy server process instead of opening multiple connections to individual lookup table files, thereby reducing the number of open file descriptors and system load.

Postfix alias databases are a type of lookup table, but proxymap's purpose is broader than just aliases; it generalizes to all lookup tables and their efficiency/chroot implications.

Mapping mail user IDs to system accounts is a function of specific lookup tables (like virtual_alias_maps, virtual_mailbox_maps) that proxymap might handle, but it's not the primary purpose of proxymap itself, which is about the mechanism of lookup access.

When Postfix daemons are chrooted for security, they cannot directly access lookup tables outside their chroot jail; proxymap can run unchrooted, serving lookup requests to the chrooted Postfix processes, effectively overcoming these restrictions.

Proxymap doesn't create lookup tables; it provides a mechanism for Postfix to query existing lookup tables more efficiently or to overcome chroot limitations.