I've experienced that several times.
It goes both ways though. I'm an auto broker, and have had several people contact me about a car. I reply back with the info, and ask if they want to see the car and never hear back. It seems that some people just want to check if their e-mail still works.
'14 F250 dd tow rig
'17 Discovery (wife's dd)
'88 110 under the knife
'12 Rockware 3-seat rock buggy - FOR SALE!
'13 LR4 - FOR SALE!
'83 110 - FOR SALE!