I have a client who is looking for email validation service. I know there are websites that validate email addresses. How can I scale it for a large email list?

Since you are looking to automate real-time email validation, you'd be well advised to use an API that lets you verify email addresses as they come into your user database. Here's a list of reputable services I know of: - mailboxlayer API (http://mailboxlayer.com) - mailgun (http://mailgun.com) - kickbox (http://kickbox.io) Jonas

You could just simply use a email address validation service such as http://www.BulkEmailChecker.com to upload the list of email addresses in CSV or tab delimited format, and then download the cleaned list after it has completed processing. It would be cheaper than building your own system to do this type of job, why reinvent the wheel?

Sure, eGrabber can help you with a tool. eMail Prospector - that finds the e-mail addresses and then checks it whether it's a valid one or not. You can import the large email list in the tool and select verify email. Result would say whether it's a Valid email or an Invalid One. You can filter just the Valid ones and use the updated database for further marketing. Download and find first 50 emails for free (*No CC required): http://bit.ly/emailprospector Full Disclosure- I am a part of eGrabber Product Management Team.

There are quite a few sales prospecting tools you could recommend to your client, most of which will let you prospect in bulk which will allow you to scale. Scaling though is down to you primarily and your internal set up, a prospect tool can only assist in this process. http://bit.ly/1nmjjnB (in private beta. Have seen myself and seems to be very good considering it is so young. I keep seeing reviews and people talking everywhere and seems to be on its way to being a market leader. Will allow you to prospect, do email automation and utilize its mini-CRM all built-in) http://salestools.io/ http://datanyze.com/ (can grab you data regarding what software people are using which can be very handy if that's what you're looking for. Usually very good when selling to eCommerce prospects) http://egrabber.com/ http://lead411.com/ http://aeroleads.com/ (I don't have personal experience, but seen a few posts on Quora about it)