Six Tips For Email Direct Marketers

Ask Permission
If you ask permission to send information to your customers and prospective customers at the beginning, you will have a better chance of establishing a mutually trusting relationship.
Once You Have Their Permission
If you have the permission of the customer to share the information, do it wisely. If you do not, ensure that you have taken the appropriate measures to ensure confidentiality.
The From Field Is As Important as the To Field.
Often, customers will make the decision to open or close their message on what they see in this field. Use your company name when possible and treat it as legitimate copy to be reviewed and edited.
Unsubscribing Should Be Easy and Clear
There are a number of ways to help your customer to unsubscribe if they choose to do so. However, if it is easy to understand and do, it will enhance your confidence that you have reliable opt-ins.
Keep It Short
Most people do not like to read beyond the bottom of the
screen. Get the most bang out of your first paragraph.
The Best Time to E-mail
The best time to e-mail someone is early afternoon. The morning rush tends to lead to quicker removal of e-mails from peoples queues. Also, Tuesdays and Thursdays tend to be better for B2B e-mails while Saturday and Sunday tend to be better for B2C communication.