Asok, you told that you use a transformerless supply for your IR receivers. Does that mean, that you have no galvanic isolation to mains there? This would explain, why you want to use a relay to inform your master electronics.

Take care, though, that the relay is driven in such a way, that the solenoid potential is nearer to neutral than to phase. Also take care, that the coupling capacitance between solenoid and switching contacts is minimal. Otherwise relevant common mode noise can be superimposed to the switching potentials and can interfere your circuit.

If transformerless means, what I mentioned above, excessive low pass filtering ("done to death", as Erik correctly stated) is needed, in combination with Schmitt trigger buffers at the master. Also, a proper ground routing is needed to shunt the common mode noise arround critical circuitry.

Kai