Nobroker emails deleted for some customers

Increasingly it appears that some cybercriminal is stealing all the emails of the domain investor.,
The domain investor had shortlisted a cheap property at Ghansoli,listed for sale.
She had asked for the contact details of the seller
She did not get the contact details, however she got a message that the property was sold,indicating that Nobroker probably sent the email.
However, the domain investor never received the email, because some hacker deleted it,
This exposes why email marketing is a waste of time, all the leads,orders are stolen by hackersand the person doing the marketing is getting nothing despite spending time.