Both the text and the buttons and graphics in the message must be large enough to be visible on every screen. At the same time, moderation should be maintained so that it does not later turn out that, for example, the CTA takes up the entire screen.
For text, the minimum font size is 14 (for regular email list of australia text, headings must be larger), while the button should be at least 44 × 44 pixels. The CTA content should not be too long, so that it does not take up two lines - it is best to limit yourself to a few words.
The optimal call to action is simple, direct, and engaging. It should specifically indicate the action you want the user to take, such as “Buy now” or “Download eBook.” It usually takes the form of the aforementioned button, since a link embedded in text alone doesn’t stand out as much.
When designing graphics and images for use in responsive mailing, you should make sure they are scalable and do not contain too many small details. Otherwise, they may be difficult to see on mobile devices. For example, in the case of clothing or accessories, a closer look at the advertised product will be a better option than showing the entire model or the model from a distance.
A good practice in responsive mailing is also to add alternative descriptions to all photos. In this case, if there is a problem with the full display of the message by a given mailbox, the recipient will be able to read what was on the individual images.

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Contents
What is drip marketing?
Applications of drip marketing