What is ISV (Interactive Sender Verification) ?
Interactive Sender Verification (ISV) is a spam-blocking mechanism.
The mechanism
will send verification mail to the sender to confirm his identity.
If the sender
is a real person and valid email address, he can receive this mail, read it
and
input the content inside the image to confirm his email address to be a valid
sender email
address for recipient. Then
his email will be added into recipient's white list
and the sender
will not need to do the verify again as long as his email address is still in
recipient's white list.
After verification
is done, the mail will move from queue to recipient mailbox.
The ISV is powered
by RaidenMAILD.
WebSite: http://www.raidenmaild.com