What really makes effective marketing is a well-structured e-mail campaign, but just sending across messages will not benefit you. You need to have a strong call to action that keeps your recipients going. A CTA basically means a clear instruction or request that encourages the recipient to take any desired action such as purchasing something, subscribing to your newsletter, or even visiting your website.

Why Should You Have a Strong CTA?

Drives Action: A clear and persuasive call-to-action essentially drives the recipients to action for some kind of intended action; hence, most probably they would take the wanted action.

Boosts Conversions: A well-placed and persuasive call-to-action will drive your conversion rates high, be it driving sales, generating leads, or boosting website traffic.
Measures Effectiveness: Calls-to-action can be applied in the tracking effectiveness through click-through rates and conversions.
This, in turn, will add value to the Bulk Email Data user experience by making it simple and clear for the recipient to know what you would like them to do. Calls-to-Action Tips

Be Clear and Concise: Use simple, direct language that's easily understood.
Create Urgency: Introduce words like "now," "limited time," or "exclusive" to trigger urgency for taking immediate action.
Click Now: The call-to-action button was salient with respect to the rest of the email and finally-easy to click.
Strong Action Verbs: Avail verbs that imply urgency or excitement, such as "buy, "download," "register."
Test Different CTAs: You have to test different CTAs in order to find what works better. You might want to consider A/B testing to find out what calls to action work better for your audience.
Examples of Effective CTAs

"Bought Now"
"Sign Up Today"
"Download Your Free Guide"
"Learn More"
"Claim Your Offer"
CTA Placement

Where you place your CTA in your email may also affect effectiveness. Here are some general guidelines to consider:

Above the Fold: Place your CTA above the fold in your email to make sure that it is one of the first things seen when the email is opened.
Bottom of Your Email: Place a concluding CTA at the bottom of an email in order to summarize your key point so the reader will take some sort of action.
Stand-alone Section: Make sure the CTA is placed outside of or in its own section-so it is separated from other sections of your email content.
Follow the above tips, and you shall face no problem in sending those emails that can create a strong call to action within less than a second. As a matter of fact, you can ensure meeting up with the meeting with marketing objectives by mere use of just one well-crafted CTA since one can be powerful enough to drive conversions and construct an effectual email marketing campaign.