Email marketing has evolved rapidly alongside the technological growth of the 21st century. Prior to this growth, when emails were novelties to the majority of customers, email marketing was not as effective. In 1978, Gary Thuerk of Digital Equipment Corporation (DEC) sent out the first mass email[1] to approximately 400 potential clients via the Advanced Research Projects Agency Network (ARPANET). He claims that this resulted in $13 million worth of sales in DEC products,[2] and highlighted the potential of marketing through mass emails.
These automatic emails should make the CTA big and clear. Keep in mind that the CTA should link to the direct offer -- NOT to the form. In these emails, simply thank the reader for their form submission, and give them what you promised, whether it be a link to the PDF of an ebook, instructions on how to activate their free trial, or the coupon they requested. Furthermore, don't overcomplicate the appearance of these emails. The reader isn't looking for additional information, but rather the offer or content they already know they redeemed.
Brand Awareness: Similar to newspapers, newsletters create a certain anticipation in readers. Whether it is a daily newsletter or a weekend communication, you get into the habit of receiving it. If you enjoy the content, you will most likely stay subscribed to the newsletter and look forward to getting the next email. By building a habit in your email subscribers, you enable them to recognize your brand and associate it with a positive sentiment.
Email marketing services make it far easier to produce beautiful email newsletters and emails of all types that match your business branding and are eye-catching and appealing. Consistent branding is important, so ESP templates make that easy to deliver. The best ESP providers offer a range of templates and drag-and-drop elements that make it simple to design an attractive e-newsletter or sales emails. With email marketing services you can include images, video content, and many different fonts, and place them in exactly the right spot for maximum effect.

Email marketing is directly marketing a commercial message to a group of people using email. In its broadest sense, every email sent to a potential or current customer could be considered email marketing. It usually involves using email to send ads, request business, or solicit sales or donations, and is meant to build loyalty, trust, or brand awareness. Email marketing can be done to either sold lists or a current customer database. Broadly, the term is usually used to refer to sending email messages with the purpose of enhancing the relationship of a merchant with its current or previous customers, to encourage customer loyalty and repeat business, acquiring new customers or convincing current customers to purchase something immediately, and adding advertisements to email messages sent by other companies to their customers.
According to IBM Marketing Cloud, the mean global hard bounce rate is 0.47%. A hard bounce is an email that’s returned to the sender because of an invalid address. If the email does make it to your intended recipient, they still have the option to report the email as spam. If you’re consistently marked as a sender of spam you’ll hurt your deliverability rates for all subscribers.
Once you've tested the entire roster of emails listed above, you'll see that subscribers respond to some emails more than others. Don't be surprised if they're not just looking out for discounts. After all, email marketing is really about building a long term relationship with your subscribers. That kind of relationship-building requires more planning and variety. In return, you'll get better brand recall and customer loyalty. 
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