[SoftTalker]

I read your email, got interrupted, and did not reply. Then I forgot about it.

If you email me again, it might get read at a more convenient time, and I'll answer.

Same reason I might not answer your call: I'm busy with something else or not near my phone at the moment. This used to be normal by the way -- if I called your home phone and nobody answered, I'd have no choice but to call again later.