Why do I receive a "File Not Found" error when I try to export email from Horde?

If you receive this error, your email inbox's memory may exceed the memory size limit that the system allocates for the cPanel PHP modules.

The memory_limit setting in the /usr/local/cpanel/3rdparty/etc/php.ini file restricts the maximum memory size of an email folder that you can export via Horde's export function. If your email inbox exceeds the memory_limit setting, the export process will fail.