I am using contact form 7,
However it only successfully sends the email if the senders email address is already known to the receiver.
I have tested the form several times from several emails I know of and also from emails that I do not know. And only the email addresses that are already in my contact list successfully come through.
The others do not at all, not even to spam.
And also the person who fills out the form always gets an indication that the form has been successfully sent so there is no way to find out who has actually filled it out.
Has anyone else had a similar problem?