A lot of people ask what an email validation system really does and if it really helps catch bogus email addresses.
The short answer is, it weeds out good email addresses from bad. However, all email validation systems are not created equal. Some help and others don’t.
A standard method is to use server-side scripting on Web forms to verify that emails are input correctly; it’s easy to defeat this method though by simply typing in firstname.lastname@example.org.
With a standard email validation system, this example passes muster because it has a name, an @-sign and a TLD (Top Level Domain. Ex. .com, .org, .net): Not so with an instant, advanced email validation Web Service. If you’re in e-commerce, or any business that’s dependent upon correct email information, you’ll need more than server-side scripts to weed out bogus email addresses.
An advanced email validation Web service uses tricky algorithms to quickly identify bad information within email addresses. Think of an email validation Web service as an online x-ray device that sees through an email address’ basic structure to identify shortcomings that are not obvious by mere observation.
While standard email validation falls short in identifying bogus email addresses, advanced email validation goes the extra mile and does a pretty thorough job. An email validation Web service checks for things like: does the domain really exist? If it does, does it have rules for allowable domain names? Can it contain numbers, vulgar terms? Does the mailbox even exist within that domain? What about the SMTP server?