A premailer processes your email's HTML and CSS to ensure compatibility across various email clients. It typically performs the following tasks:
Inlines CSS: Moves CSS styles from the <style> block directly into the HTML elements. This ensures that the styles are applied correctly across all email clients. Fixes HTML: Corrects common HTML issues, such as unclosed tags, to ensure the email renders correctly. Optimizes Images: Adjusts image sizes and formats to improve load times and compatibility.