Yes. There's nothing that says you can't settle something amicably while still getting legal counsel. They've roped in their lawyer, now you rope in yours.
When you've found a lawyer, he/she will advise you on what to say and not say from that point forward. In the meantime, the safest course is to say nothing (or at least the absolute minimum you can) from now until then. If you've already sent an email you can't take it back, obviously, so when you get a lawyer be sure to give him/her a copy of the email (and any response you receive) so they can advise you on how it affects your position.
When you've found a lawyer, he/she will advise you on what to say and not say from that point forward. In the meantime, the safest course is to say nothing (or at least the absolute minimum you can) from now until then. If you've already sent an email you can't take it back, obviously, so when you get a lawyer be sure to give him/her a copy of the email (and any response you receive) so they can advise you on how it affects your position.
Good luck!