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I like using premailer-rails to inline the CSS in my Mailer, which allows me to have super clean views while supporting old Email clients (like Outlook).
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Sevalla
Deploy and host your apps and databases, now with $50 credit! Sevalla is the PaaS you have been looking for! Advanced deployment pipelines, usage-based pricing, preview apps, templates, human support by developers, and much more!
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postcss-css-variables
PostCSS plugin to transform CSS Custom Properties(CSS variables) syntax into a static representation
More recently, I started using postcss-css-variables to convert CSS variables into values so I can use modern CSS frameworks like Bootstrap 5 & Tailwind within my mailers.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.