+tie my %postfix_native_mailbox_map, 'Tie::IxHash',
+ 'userid' => 'email',
+ 'uid' => 'uid',
+ 'gid' => 'gid',
+ 'password' => 'ldap_password',
+ 'mail' => 'domain_slash_username',
+;
+my $postfix_native_mailbox_map =
+ join('\n', map "$_ $postfix_native_mailbox_map{$_}",
+ keys %postfix_native_mailbox_map );
+