There are some tools as per your requirement you can use all these

1. Email Hunter - Hunter is the easiest way to find professional email addresses. Give a domain name and get the list of all the emails related to it found on the internet. Add email hunter extension(Available for Chrome and Firefox browser both) to find the email address.

2. FindAnyEmail.net - Instantly find and verify any email address. Just enter the first name, last name and the domain (www.company.com) of the company they work for. We will do the hard work of finding their email address and contact information

3. QuickReach.io

4. FindThatLead.com- FindThatLead gives you the power to connect with people that matter to you. A simple Chrome plugin that gives you the power to view anyone´s professional contact information and social data, while you are logged into Linkedin.

5. SellHack.com- SellHack is a browser extension to build prospect lists. Verify email addresses and phone numbers. Export your leads and start sending cold emails.

All these tools search an email for you on request rather than using databases which might have old/inactive addresses.

I hope all my suggestion are useful for you.

You can find below some tools to get Email Ids of potential clients:

Clearbit Connect- Clearbit connect is a good gmail plugin that supercharges your inbox.
Snapbird - Snapbird is an awesome tool for finding someone’s personal email address. This is a twitter search engine. People will sometimes share their email address on twitter when someone tweets at them that’d they like to send them something. You can use this tool for get the email Ids of potential clients from specific domain.
Toofr- Toofr is another tool to find email addresses .

As a Digital marketer, your goal should be to collect as many email id of potential clients as possible through available online tools, you have to be very careful about the email address you are sending your emails to. Emails will be opened and read only when it reaches the right address. Having an accurate and updated email list is essential in reaching your targeted audience at the right time.

Though there are many tools available on the market using which you can get email list without spending much time.

1. Idleadgen- https://idleadgen.com/

2. Hunter -https://hunter.io/

3. Findthatlead - http://findthatlead.com/

Below are some tools which helps in getting the Email Ids:

Buzzstream: Is a long-time market leader in the outreach space. As well as providing an amazing outreach tool to track your sends, replies, and more, Buzzstream allows for some great contact details via its extension, the Buzzmarker.

Ninja Outreach: Become a nice tool in the outreach space. Rather than making you crawl through the potential contact details of a site, this service automatically brings it to you.

WHOIS data: WHOIS data is publicly available, and is primarily used when registering a domain.

Hello Ridhima,

Following are some of the ways to get the email Ids of potential client:-

1. The best and cheapest way to find email ids is by searching them on Google

2. There are many free platforms also like Benchmark Email, GetEmail.io, Vertical Response etc, from where one can get bulk email ids of  the prospect.

3. If an individual is interested in investing in paid tools, then he/she can go for ExactTarget, Vertical Response, Marketo, Silverpop etc.

Email is one of the effective and cheapest ways to reach a prospect, and aware about one's products and services. Significant email data can be generated from various sources, which includes Twitter, Facebook, G+, LinkedIn and other free and paid websites.

Google is the best and the cheapest source for generating email data as per your target audience. Anyone can easily get free and bulk prospects email ids while searching on Google.

There are many free tools as well from where an individual can get ample no. of email ids of the prospects, which includes Lead411, Email Hunter, Clearbit, Slik Prospector, RocketReach, and GetEmail.io etc. Anyone can use these tools and get email ids free of cost for limited time period and if he/she finds that, it's the best tool to get the email ids, then he/she can go for paid version for the same.

In today's environment email seem easiest way to do  this, as there are different tools and technique for searching authentic emails but let me share a process  that you can follow to start with it.
1. Go to the Linkedin and based on location, profile and any other profile details, identify relevent people.you would require the prospective account.
2. Note down the First Name , Last Name and Company Name of identified person.
3. Based on company name identify their domain name, which is being used in their email id. For example (firstname.lastname@companyname.com).
4. The above process  is the simplest form of finding emails another tools you can use for searching emails is 'Lead411' this is the paid tool ,it provide database of company contacts.you can simply enter the company name of the client on a search result and the list of emails are available.
5.You can also search the emails from twitter account, facebook account,linkedin account also.

There are many tools available online all you have to do is just type the desired company name and you will have all the email addresses..so what all you have to do is just sign up with hunter.io and start sending emails.