One ready-made excuse

Take this and vanish gracefully.

I am currently unavailable for a timely reply. I am taking vacation seriously enough to avoid real-time responses. Please treat most business escalations as suspicious until proven urgent. I plan to follow up when I am back online. If the issue cannot wait, contact the on-call lead or team alias. I appreciate your patience.

Professionally ignoring you with the help of Half Baked Out of Office
https://ooo.halfbakedidea.ca?ref=copy

Tweak it, steal it, disappear for a while. Leave the breadcrumb if it feels charming.

Keep the same energy

More in this vein

If this one isn't quite it

Other ways to duck out

Pick one for me