Meta keywords are different from usual keywords since they are only in the source code of your web page, instead of the living, visible web page. Anyway, meta keywords can be filled out later on if you need to, but focus on the things that matter first. Integrate keywords for the meta description tag. Do this just for the page description that comes up in search engines.
How do you find the sweet spot? The best way is to monitor statistics from your email blast software. See how many recipients open your emails, how many click a link, and how many unsubscribe. (Pay attention to the type of recipient, too, as your open rates for loyal customers will be different from new prospects.) Learn what works, make changes, and test again.
Keep your list fresh and up-to-date – It’s an unfortunate fact of life that occasionally email addresses become invalid. People’s work email addresses change as they move between companies and others abandon old AOL and Compuserve email addresses in favor of modern platforms like Gmail. However, by focusing some of your time and energy on building your email list, you can fight list decay and ensure you have a growing list of people to receive and click-through on your email campaigns.
E-marketers must operate their businesses in compliance with numerous laws. For example, e-marketers are responsible for protecting customers' privacy; without customers' permission, they are not legally allowed to share or sell customers' information to a third party. Copying other businesses' Web information for commercial use is also in violation of copyright law.
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.