> This is a bashism. The script should begin #!/bin/bash, not #!/bin/sh.
Or rewrite it in plain sh:

l=""
for i in ${MAIL_PLUGINS}; do
        case $i in
                imap_quota|mail_log) ;;
                *) l="$l $i";;
        esac
done

MAIL_PLUGINS="${l# }"

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