The Fifth Circuit has determined that an immigration in immigration court proceedings has an obligation to provide a US-based address to which the immigration court can send notices of hearing. The court has no obligation to mail a notice to a foreign address.
The full text of Ramos-Portillo v. Barr can be found here:
http://www.ca5.uscourts.gov/opinions/pub/17/17-60254-CV0.pdf