On the obvious merits of Email Verification services

There is considerable market demand for Email Address Verification (EAV). This is reflected by the fact that numerous companies have specialized in this field. For example, Return Path, Inc., the largest email intelligence and deliverability service provider, which works closely with numerous ESPs and ISPs, has recognized this fact and has started to collaborate with a major provider of EAV in order to offer its customers a benefit in email marketing.

EAV is kind of the question “How to separate the wheat from the chaff?”