Whisper Autoresponder and DND maintainer addons?

[Ozbert]

Does anyone know of any addons that can achieve one of the following:

- Auto-respond to whispers with an arbitrary message, for example "This is one of my clones. It'd be easier if you whispered my main, xyz, instead"

- Maintain the Do Not Disturb status on my alts, with a similar DND message. I find that if I manually /dnd on my characters, it always seems to switch itself off before long.

[Katharsis]

Prat has a nice custom filters module with which you could configure the auto-respond.

[Nomak]

I haven't used an addon for this but I have my /follow macro include a /dnd so I am constantly refreshing it when I follow my main.