I'm probably not the best person to answer this but...
I'm not sure if this will really slow down a large forum that much. For each email reply that is sent, it means one less user visiting the site. That means less clicks, less page generations, less MySQL queries, etc.
At the moment, there's no easy way to turn it on and off. And yes, you do need a dedicated email address because it processes every single email that arrives. I though tabout using a shared email address too but I'm too lazy (and probably too incompetent) to make the necessary changes. It was much easier to simply setup a dedicated email address.
As for viruses and other malicious code sent via email, I doubt you'll have any problems. This system is text based and any attachments are ignored and eventually deleted along with the email after processing. The only issue I see is if the dedicated email address somehow got on a spam list. It won't show up on the site but it will be a lot of useless work for the server since it processes all incoming emails. But this can be fixed by changing the email account.
Someone please correct me if anything I've said above is nonsense.
Aylwin
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