Do these sentences mean the same thing? Are thet grammatically correct? And if they mean different things what do they mean?

Question

I'm sorry I haven't responded to your emails yet. I will respond to them as soon as possible.

Do the sentences given below mean the same thing as the sentence above? And are they all grammatically correct?

1. I'm sorry I haven't responded to your emails yet. I will get back to you on those (emails) as soon as possible.

2. I'm sorry I haven't responded to your emails yet. I will get back to you on that one as soon as possible.

3. I'm sorry I haven't responded to your emails yet. I will get back to you with those emails as soon as possible.

And if these sentences mean different things, what do they mean?

Answer 1

They all have the same meaning, or almost the same. The differences are more in naturalness.

Number 1 is, I think, quite natural, but I prefer about to on (some may find this causes a slight meaning shift). Number 2 is also possible, but some people might find that one slightly odd. That one has to be understood as referring to that matter (or issue, problem, circumstance), but the matter has not been explicitly mentioned, which is the cause of the slight oddness. Number 3 is slightly odd because it refers to the response e-mails ("those e-mails") which a) do not yet exist and b) have not yet been explicitly mentioned.

My preferred locution would simply be I'll get back to you as soon as possible.