A couple of shell commands are enough
Code:
zmmailbox -z -m source_mailbox@domain.org > filters.txt
sed -i 's/^/afrl /' filters.txt
zmmailbox -z -m destination_mailbox@domain.org < filters.txt
First line extracts all the filter rules from the source mailbox to a file
Second line adds 'afrl ' (Add Filter RuLe) at the beginning of each line in the file
Third line executes zmmailbox for each line of the files, adding the filters on the destination account.
Remember that the filters must be 'logically' valid on the new account (e.g. if a filter moves mail to a folder, such folder must exist)
Be sure to check out the syntax in the file after the 'sed', run it on a test mailbox if you can
