The email content needs to be designed in a certain format. Common email formats include plain text, HTML, and Rich Media, or a combination of these formats, such as a plain text/HTML mixed format. Generally speaking, emails in HTML and Rich Media formats have better visual effects than plain text. From an advertising perspective, the effect will be better, but there are also certain problems, such as large file bytes (such as Rich Media format) and users cannot display the email content normally on the client.
There is no absolute conclusion as to which email format is better. It depends on factors such as the content of the email and the reading characteristics of the user. In foreign trade business, plain text format is used in most cases. If it is a greeting or congratulation (such as Christmas or congratulations on a promotion, etc.), HTML format or Rich Media format can be used, which will be more effective.