Cost per mille, often abbreviated to CPM, means that advertisers pay for every thousand displays of their message to potential customers (mille is the Latin word for thousand). In the online context, ad displays are usually called "impressions." Definitions of an "impression" vary among publishers,[58] and some impressions may not be charged because they don't represent a new exposure to an actual customer. Advertisers can use technologies such as web bugs to verify if an impression is actually delivered.[59][60]:59
Many email newsletter software vendors offer transactional email support, which gives companies the ability to include promotional messages within the body of transactional emails. There are also software vendors that offer specialized transactional email marketing services, which include providing targeted and personalized transactional email messages and running specific marketing campaigns (such as customer referral programs).[citation needed]
Are you really willing to risk not only your email deliverability, but also the reputation of your IP address and your company? Even if you find the light after purchasing or renting email lists and decide to only email those who have opted in with your company, it'll take you months (or maybe years) to get your Sender Score up and rebuild the reputation of your IP.

There are many vendors out there who sell lists or rent them (though renting means that the list seller maintains ownership and control of the email list). These are collections of email addresses that the vendors sell to any business or individual who can pay the fees. Your email list is considered to be a purchased or shared list if it’s provided to you by a third party, like an email list vendor or affiliate. There's a few ways that vendors build these non opt-in email lists.
Thank you for this great roundup of tips regarding marketing emails. I especially appreciate your mention of tracking emails so you can continually improve your strategies, including an above the fold call to action so customers know exactly what to do next, and most of all making sure you have a solid (not necessarily huge) email list. Reaching out to those you know may be interested in your company and what it has to offer is always going to garner you the best results. I would also love to add that focusing on the customer, proofreading your email, and making the email conversational are other excellent tips for making your sales emails stand out and actually get read. Thanks again for sharing!
For the design element, odds are that unless you have an artistic background, you’ll be either using a pre-existing template from your printer or having it designed by a graphics designer. The templates from your printer will more than likely have an effective eye flow and a solid ratio of graphics to text – if you go the designer route, be sure to get several mock ups and again seek the opinions of those around you whose opinion you value. And finally, print quality should be self-explanatory – be sure to go with a printer that offers some sort of guarantee on quality, or at the very least one that will offer you a refund or reprint if you’re not 100% satisfied. The last thing you’d want to do is have to settle on a poorly printed mailer to save costs.
Thank you for this great roundup of tips regarding marketing emails. I especially appreciate your mention of tracking emails so you can continually improve your strategies, including an above the fold call to action so customers know exactly what to do next, and most of all making sure you have a solid (not necessarily huge) email list. Reaching out to those you know may be interested in your company and what it has to offer is always going to garner you the best results. I would also love to add that focusing on the customer, proofreading your email, and making the email conversational are other excellent tips for making your sales emails stand out and actually get read. Thanks again for sharing!
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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