It would be nice if there was some kind of safeguard against stupid mistakes like this! Could you make a check, please, that at most X messages may be selected when Reply is hit and if number_selected > X, show a dialogue where users have to confirm that they really intended to reply to several hundred messages at once? I think X=10 would be a good value: It should be rare that anybody would want to open that many message windows at once, so it wouldn't interfere with users' workflow in general. If somebody really wanted to open that many windows at once, I guess hitting a confirm button once should be OK -- but it's more likely that opening a huge amount of windows is a stupid mistake that could be prevented that way.
Best regards! Andreas
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