There are normally two options

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You can opt for a longer preview text , but this runs the risk of awkward truncation if it gets cut off by email clients.
You can choose a shorter preview text , but some email clients may insert URLs and other “unoptimized” content from your emails to fill the remaining space.
To overcome this challenge, careful thought and strategic decisions are essential. Here are some guidelines to consider:

Put the most essential information first within the most limited character count to ensure it is effectively included in the preview.
Rather than writing a long text that might get cut off, break your preview text into easy-to-digest segments, separated by symbols like the pipe (|).
Seamlessly integrate the preview text with the beginning of your gambling database to allow for contiguous reading (this is perfect if you are sending cold emails with a personalized approach !)
Consider repeating the preview text multiple times in the space (although we at DB to Data do not approve of this technique, it is important to mention that it is used by Facebook).
Use spaces strategically as you will see later in this article.
How to Prevent Preview Text from Being Followed by Other Email Elements
By structuring your email template code correctly, you can avoid having your email preview text immediately followed by unwanted additional content, such as “View this email in your browser”.

One approach is to place the “View this email in your browser” link within the body of the email, rather than adding it directly after the preview text. For the same reason, when composing the email, avoid immediately following the preview text with elements such as images, social media icons, or calls to action.

Also make sure that your email template is responsive and optimized for multiple devices, as rendering inconsistencies can cause extraneous elements to appear.