I have attempted this several times with varying degrees of failure. In some cases, the sender deleted the hello, and then attempted another hello later. In s

I have attempted this several times with varying degrees of failure. In some cases, the sender deleted the hello, and then attempted another hello later. In some cases, the sender would wait a few hours and say hello again, or some just email me instead (they must have assumed I am not available). In one exceptional case, I waited 2 days before saying "hello" back, and they then immediately continued the conversation as though no abnormal communication gap had occurred.