Currently, I am in India and I have to file my US Federal tax return by July 15, 2020. However, the postal service from India to USA has completely been blocked due to Covid-19. I am seriously puzzled about the situation. Please suggest any means to resolve it.
I don't know if it corresponds to your facts on the ground, but the US Postal Service seems to think that some mail is flowing from India:
India Post advises a lockdown due to COVID-19 has been extended until May 31. Limited domestic mail exchanges continue in order to provide essential services. However, with the availability of certain cargo and evacuation flights, outbound express mail and international tracked packet services have resumed. All offices of exchange and airmail units are functional; however India Post cannot guarantee service delivery.
If this is not an option, consider private international shipping services like FedEx, UPS, and DHL, which can deliver to the IRS.