I've just noticed that persons who are not logged into the system can access and use the "send message" form to send messages.
This leaves the ad owners open to all types of spam, abuse and fraud, since spammers can enter unverified email address in the email field. I can imagine that it might also overload the system resources if a handful of spammers start using the form to email a few thousand ad owners.
Would you please add the following features in the next update?
1. Users must be logged in to send a message.
2. Set a limit to the number of messages that can be sent to any ad owner in a 24 hour period.