One of Raquel’s suggestions is to make sure the email contains a clear call to action. The recipient should be able to tell right away what you’re asking them to do, and when they click through, they should be taken to the exact page they need, not just your homepage. If you ask them to click on a video thumbnail to watch a video, you need to link them directly to the video. If you’re asking them to read your latest blog post, link them right to it. https://echogravity.com/wp-content/uploads/2015/10/What-to-Expect-When-You-First-Launch.png
Another disadvantage is that even an individual or small group of people can harm image of an established brand. For instance Dopplegnager is a term that is used to disapprove an image about a certain brand that is spread by anti-brand activists, bloggers, and opinion leaders. The word Doppelganger is a combination of two German words Doppel (double) and Ganger (walker), thus it means double walker or as in English it is said alter ego. Generally brand creates images for itself to emotionally appeal to their customers. However some would disagree with this image and make alterations to this image and present in funny or cynical way, hence distorting the brand image, hence creating a Doppelganger image, blog or content (Rindfleisch, 2016). https://cdn0.tnwcdn.com/wp-content/blogs.dir/1/files/2015/05/emailcampaign-1200x639.jpg
Advertisers may also deliver ads based on a user's suspected geography through geotargeting. A user's IP address communicates some geographic information (at minimum, the user's country or general region). The geographic information from an IP can be supplemented and refined with other proxies or information to narrow the range of possible locations.[28] For example, with mobile devices, advertisers can sometimes use a phone's GPS receiver or the location of nearby mobile towers.[29] Cookies and other persistent data on a user's machine may provide help narrowing a user's location further.[28]
Email marketing is now a very popular offshoot of direct mail marketing (See also Email Marketing). However, it’s worth bearing in mind that 37 states now have laws regarding “spam,” or unwanted junk email. Therefore, companies that wish to maintain a positive reputation use an “opt-in” policy for marketing email, targeting only interested customers.

Particular groups of customers can be targeted or even individuals. Offering individual customers special deals on merchandise and/or services on the customer's birthday, for instance, is one example of email marketing personalization. (A restaurant might send an email to customers on their birthday offering 50% off an entree,) Email marketing helps a business develop and maintain a relationship with a customer over time that hopefully results in increased sales and increased customer loyalty. 

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