2. If you are quoting the previous comments in a thread, delete everything not absolutely necessary.
3. Instead of replying to the summary email, maybe find the specific thread you want to reply to and reply to that.
4. If you are using email to reply, disable including footers - especially if they advertise your services / website.
5. Instead of using email, come to the site.
These are the only things I can think of to try to reduce the erroneous "Pending" status and deletions. Feel free to add any of your own suggestions to this thread - I plan to pin it so it's more visible.
Liz