I tried using PadMapper to send inquires about places to rent but after giving PadMapper my email they FLOOD MY EMAIL EVERYDAY with new places and the same ones too over and over again. If you harass your users like this without telling them they will receive 10 notifications a day then they will not be returning to use your service. PadMapper is great at SPAMMING you beware.
Also please don't reply saying you have some small $#*! text somewhere saying 'you agree to receive notifications' because we all know now a days that it is shady and scummy.