Mailing design is very important and is the reason some big brands cannot reach success by e-mail marketing. The text of the e-mail should contain only the relevant things. The e-mail should be eye-appealing by the colors or images used. Long texts would be very boring and affectless, the texts should be short and direct. Also, the sentences should be short. The design of the mail should not be over 680 pixels. The loading time of an e-mail should be short since the users don’t want to wait for a long time. Each image in the e-mail should not be over 120 KB.