Direct Mail Printing and Addressing: Depending on which printer -- online or local -- that you work with, costs will vary. There are also other variables that will impact cost, including size of your direct mail piece, as will your use of color vs. black & white, type of paper used, whether your marketing list will need to be cleaned up, and other caveats.
Most email marketers around the world are legally required to allow recipients to opt out of emails they no longer want to receive. Contacts must be able to do this directly in the email message. The General Data Protection Regulation (GDPR), a European data privacy act that went into effect in May 2018, doubles down on the opt-in side of this relationship. And purchased email lists are simply not compliant.
Word of mouth communications and peer-to-peer dialogue often have a greater effect on customers, since they are not sent directly from the company and are therefore not planned. Customers are more likely to trust other customers’ experiences.[22] Examples can be that social media users share food products and meal experiences highlighting certain brands and franchises. This was noted in a study on Instagram, where researchers observed that adolescent Instagram users' posted images of food-related experiences within their social networks, providing free advertising for the products.[26]
The recipient of your email blast is unlikely to commit a lot of time to reading what you send. If you keep the content short, make it easy to scan and easy for them to digest, it will be a much better value for both of you. Aim the content toward providing the reader with enough info to get them interested and then encourage them to follow the links to learn more.

A standard industry term used in email marketing to describe the act of "blasting" a message out to a group of hundreds or thousands of people simultaneously, similar to the act of "blasting" a verbal message out with a loud speaker. Typically used to differentiate between two-way email interactions (where a customer emails a question and the company responds), and one-way bulk email interactions (such as newsletters or promotions).
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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