Upcoming AI summary features in Gmail, Apple Mail, and Outlook will scan the first 150-200 characters of an email for 'live text' (actual HTML text). This means placing critical calls-to-action and stats as plain text at the top of emails is now more important than large hero images.

AI tools like Copilot and Gemini generate inbox summaries by pulling from the first 150 characters of "live text" (HTML text) in your email's body. This content often overwrites the pre-header you've written, making the email's opening sentence more critical than ever for engagement.

AI tools in email clients are generating summaries that replace marketer-written preheaders. These tools pull content from the first 150 characters of 'live text' (HTML text) in the email's body, making this opening content critically important for controlling the message in the inbox.

AI tools now summarize emails in the inbox. To earn an open, your email's core value must be immediately apparent in that summary, as generic content will be dismissed without a click. This fundamentally changes email copywriting.

To optimize for AI summaries, marketers must shift away from visually slick, image-heavy headers. The focus is now on raw, scannable text content at the top of an email. This represents a strategic regression to simpler email structures, prioritizing AI readability over complex visual design.

AI tools increasingly summarize emails directly in the inbox, heavily influencing the decision to open. To ensure the summary is compelling, place the key takeaway, offer, or value proposition at the beginning of your email, rather than burying it after a long introduction.

The traditional email pre-header is becoming obsolete as AI summaries auto-generate replacements by extracting content from the email's body. An estimated 50% of pre-headers will be AI-generated soon. Marketers must now focus on crafting a compelling opening 150 characters in the email body itself.

Instead of asking an LLM to generate a full email, create a workflow where it produces individual sections, each with its own specific strategy and prompt. A human editor then reviews the assembled piece for tone and adds "spontaneity elements" like GIFs or timely references to retain a human feel.

The rise of AI summaries is forcing a strategic shift away from slick, image-heavy email designs. To ensure key messages are captured by AI, marketers must prioritize live text at the beginning of their emails. This marks a functional return to simpler, text-focused structures from 10-15 years ago.