Shootmail has purpose built, beautifully designed email templates, that are well-tested to support major email clients like Outlook, Apple mail, Gmail etc. All the templates support dark mode. Shootmail has two offerings:

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Pre-built email templates

Emails designed and tested by the Shootmail team. This is a growing list of email templates categorised by different business use cases. Templates Link

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Shootmail editor

Shootmail editor is notion-like editor especially designed to create highly compatible emails.