Affiliate marketing - Affiliate marketing is perceived to not be considered a safe, reliable and easy means of marketing through online platform. This is due to a lack of reliability in terms of affiliates that can produce the demanded number of new customers. As a result of this risk and bad affiliates it leaves the brand prone to exploitation in terms of claiming commission that isn’t honestly acquired. Legal means may offer some protection against this, yet there are limitations in recovering any losses or investment. Despite this, affiliate marketing allows the brand to market towards smaller publishers, and websites with smaller traffic. Brands that choose to use this marketing often should beware of such risks involved and look to associate with affiliates in which rules are laid down between the parties involved to assure and minimize the risk involved.[47]
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.
This ties into the second 40 of the 40/40/20 rule – now you’re probably beginning to see why that was listed up front and why it’s universally considered the gold standard when it comes to direct mail marketing guidelines. With other forms of advertisements or marketing, it is perfectly acceptable to only go after impressions – a billboard in a highly-trafficked area or a TV spot that is more of a teaser in nature can sometimes go a long way toward educating the public of your existence, which is the first step in getting them to engage. With direct mailings however, you might as well be printing cash to send out to people if you don’t have a compelling call to action to give people.
Even though this falls into just one of the myriad of elements in the 20 portion of the 40/40/20 rule, it is arguably the most important. Nothing will get your piece of direct mail marketing throw into the trash bin more quickly than a glaring typo, a noticeable formatting issue, or an overall poor print quality. If you’re writing the copy, be sure to not only proof it yourself but also have some of your more linguistically-inclined friends and colleagues give it a once over, not only for grammatical and punctuation mistakes but for overall ease of reading and flow. Don’t be afraid to seek as many trusted opinions as possible, and be sure to have thick skin to prepare for any constructive criticisms.
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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