Time frame to show proof of receipt?

I have sent two sets of the proper forms to a foreign country. The soon to be ex-wife has received both, but I have yet to receive anything back. No signed proof of service or any other documents. She emailed me saying she got them, but someone other than her signed. This country’s mail serice is not very responsible. It’s been 33 days since the original paperwork was sent. Is there a time frame to show proof ? Will I have to refile? I do have the postal receipts showing I sent them registered mail to her address.

The email is not really proof of service- you need the certified mail receipt.
The summons is good for 60 days (she must be served within 60 days) after that you need to get an A and P summons and send it with a new copy of the complaint.