There is nothing illegal about faxing a subpoena but it is not valid service. It is up to the company whether to respond or insist upon proper service.
The above answer, and any follow up comments or emails is for informational purposes only and not meant as legal advice.
It's not a matter of it being "legal" or not, it's a matter of whether it's proper service - it's not. Subpoenas must be served in the same manner as a summons. Schedule a consult with a NYC Family Law attorney.
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No subpoenas cannot be faxed. They must be served in the same manner as one would serve a summons. However some companies will accept a subpoena by facsimile.
This for general information purposes only and should not be taken as legal advice for any individual case or situation. This information is not intended to create, and receipt or viewing does not constitute, an attorney-client relationship.