ezmlm-get(1) archive retrieval functions can be used to deplete system resources. However, this can also be done by posting messages to lists, mail bombing, etc. If you are worried about this, you can use a combination of ezmlm-manage/ezmlm-get -C, -s, and -P switches, removal of DIR/public, and removal of the mail-triggered digest function (by removing the digest code from the ezmlm-get(1) command line) to decrease availability of these functions (see man pages). Digest can also be triggered by direct execution of ezmlm-get from within a script from DIR/editor as in the default setup with the ezmlm-make(1) -d switch.