He can sign papers in another state as long as they are notarized. He can accept service in written form. Your attorney will walk you through it or you can deal with it pro ae. Good luck.
I have been a criminal attorney in New York for almost 25 years. website: Brooklynlaw.net Phone #: 718-208-6094 email: email@example.com. This answer is only for informational purposes and is not meant as legal advice.
If you mean can you serve him with the summons and complaint for divorce by the mail the answer is YES if he accepts. See CPLR section 312-a for the form and procedure.
I am a former federal and State prosecutor and now handle criminal defense and personal injury/civil rights cases. Feel free to check out my web site and contact me at (212) 577-9797 or via email at Eric@RothsteinLawNY.com. I was named to the Super Lawyers list as one of the top attorneys in New York for 2012. No more than 5 percent of the lawyers in the state are selected by Super Lawyers. The above answer is for informational purposes only and not meant as legal advice.
He can sign a consent and waiver to the divorce in another state. The Consent must be in proper form and notarized. If you have unresolved issues such as joint property, debt, custody or support, you will still need to resolve those as well. That too can be done by a signed settlement agreement. If he is signing that out of NY state it needs to bear a full out of state notary, which is different from New York. Be sure to get the advice of counsel.