Direct mail is a type  of direct marketing in which businesses send letters, postcards or other promotional materials to past, current or potential customers or clients. Direct mail campaigns may be targeted to either a consumer or business or both.  In many cases, the mailing is directed to a target demographic (i.e. home owners) or geographic market (i.e. a specific neighborhood). In most cases, it's mass or bulk mailing, but you can send direct mail in smaller quantities as well.
Discussion lists often require every message to be approved by a moderator before being sent to the rest of the subscribers (moderated lists), although higher-traffic lists typically only moderate messages from new subscribers. Companies sending out promotional newsletters have the option of working with whitelist mail distributors, which agree to standards and high fines from ISPs should any of the opt-in subscribers complain. In exchange for their compliance and agreement to prohibitive fines, the emails sent by whitelisted companies are not blocked by spam filters, which often can reroute these legitimate, non-spam emails.[3]
But affiliates can be very guarded when it comes to their mailing list, we can’t blame them because we jealously protect our own email list too. When it comes to asking someone to promote you over their highly valuable email list you have to make sure that you’re offering them and their audience something that’s worth their time. Which is why we we strove to make sure our lead magnets were as valuable as possible so that their audience wouldn’t see this cross-promotion as spam, but something that’s worth their time.
Not only is InVision's newsletter a great mix of content, but I also love the nice balance between images and text, making it really easy to read and mobile-friendly -- which is especially important, because its newsletters are so long. (Below is just an excerpt, but you can read through the full email here.) We like the clever copy on the call-to-action (CTA) buttons, too.
Say you’re launching a beta test soon or collaborating with someone on a side project outside your typical newsletter scope. In an installment of the newsletter you usually send, briefly mention the project and provide a link where interested parties can go to sign up for updates about it. This way, those who aren’t interested only had to hear about it once and in a non-invasive way. A user experience win and a win for you, the guy who has two thumbs and a super-engaged email list sub-segment.
Just like an ebook, a cheat sheet or guide is a very simple way to capture emails and generate more leads. In fact, if you’re familiar with DigitalMarketer you’ll know that they often promote this lead magnet over others. It’s actually performed so well for them it managed to generate 28,000 new leads for the business in its first month and a half.

You have to realize, whether you are a business with a physical presence or work completely online, marketing in the internet is something you have to work with and put to your advantage. This would mean that you could reach millions of people around the world. It is unsurprising, then, that businesses have been moving more and more of their marketing resources online.

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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