--- title: "Email" description: "15 posts about Email, summarised, each linking to the original." --- # Email > 15 posts about Email, summarised, each linking to the original. ## Articles ### [Design Email for Humans and Agents](https://yomu.fyi/post/design-email-for-humans-and-agents.md) - Company: [Resend](https://yomu.fyi/company/resend.md) - Author: Kiersti Esparza - Published: Oct 14, 2026 - Type: Problem & solution Apple Mail and Gmail now generate AI summaries of emails, while agents read messages to automate tasks like logging receipts or tracking deadlines. Summarizers focus on the first 100 to 150 characters, so the main point and call to action must lead the email. Semantic HTML with h1 headings, a descriptive title, lang attributes, and role=‘presentation’ on tables creates a machine-readable outline, yet the Email Markup Consortium found 74% of emails lack an h1 and 96% lack lang. Hidden text styled to be invisible can hijack summaries, as Forcepoint demonstrated, and similar attacks have targeted Gemini in Google Workspace; such practices also trigger security flags. Testing in Gmail, Apple Mail, and Outlook, along with verifying the plain text version, confirms that both humans and agents interpret the email correctly. ### [How Live Chat Can Warm Up Your Cold Outbound Leads](https://yomu.fyi/post/how-live-chat-can-warm-up-your-cold-outbound-leads.md) - Company: [Intercom](https://yomu.fyi/company/intercom.md) - Published: Oct 9, 2026 - Type: Tutorial The post describes a technique that combines cold email outreach with live chat to avoid spammy follow-ups, based on research that leads are 82% more likely to convert after a chat. When a prospect clicks a link in a cold email, they receive a proactive Visitor Auto Message personalized with a unique UTM code, such as the author’s initials ‘?nml’. This turns outbound emails into inbound conversations, with near 100% open rates and over 25% reply rates, and allows scheduling demos in under five minutes. The post includes an example email citing Tradeshift’s success with live chat, reducing lead qualification days from 21 to 3 and increasing sales by 32%. It provides a step-by-step guide on setting this up in Intercom by creating UTM codes and triggering Visitor Auto Messages based on URL matches. ### [Peak Season Deliverability: Why Quality Beats Quantity This Holiday Season](https://yomu.fyi/post/peak-season-deliverability-why-quality-beats-quantity-this-holiday-sea.md) - Company: [Twilio](https://yomu.fyi/company/twilio.md) - Author: Adam Morales - Published: Oct 7, 2026 - Type: Problem & solution During Black Friday and Cyber Monday, email volume spikes, tempting senders to blast all contacts. However, sending to unengaged recipients leads to throttling, blocklists, and spam placement, which can delay time-sensitive holiday offers. Inbox providers use dynamic throughput based on real-time sender reputation; high engagement unlocks maximum sending velocity, while low engagement causes rate-limiting with 4xx deferrals, potentially delivering a 9 AM campaign at 2 AM. Senders with excellent engagement experience up to 100 times faster delivery than those ignoring best practices. Implementing strict sunset policies for contacts inactive 90-180 days, permission-based opt-ins, and automated verification via the SendGrid Email Validation API protects sender reputation and preserves control over campaign timing, avoiding blocklist events that take 24-72 hours to mitigate. ### [Warmup Services Harm Your Deliverability](https://yomu.fyi/post/warmup-services-harm-your-deliverability.md) - Company: [Resend](https://yomu.fyi/company/resend.md) - Author: Phil Nash - Published: Sep 30, 2026 - Type: Explainer Warmup services that simulate email engagement harm deliverability because inbox providers detect the pattern and tighten filtering, causing reputation decline that makes recovery harder. Validity’s new Heatwave blocklist identifies domains warmed through synthetic engagement, using signals from its Intelligence Network to automatically list domains crossing a threshold, and over 1.2 million domains have already been listed. The signal is shared with providers including Comcast, Proofpoint, Spamhaus, and SURBL, potentially damaging domain reputation with these providers. A domain on Heatwave receives a permanent record, and even if the domain stops cold outreach, the warming listing stays, making recovery difficult or impossible. Legitimate senders should verify their domain at lookup.validity.tools, obtain proper consent, and increase volume gradually through real engagement, as the domain warms itself through real engagement and there is no shortcut to trust; warmup activity may also run through agencies without the sender’s knowledge. ### [Welcoming Allie Sperry, our new Customer Success Engineer](https://yomu.fyi/post/welcoming-allie-sperry-our-new-customer-success-engineer.md) - Company: [Resend](https://yomu.fyi/company/resend.md) - Author: Allie Sperry and Brian Kerr - Published: Sep 25, 2026 - Type: Announcement Resend has hired Allie Sperry as a Customer Success Engineer to support its growing customer base, bringing experience from Litmus in technical support and Customer.io as a deliverability consultant. Sperry describes herself as an email nerd who enjoys helping developers and builders navigate the complexities of email at scale, and she discovered Resend while building an email sending app for fun using AI tools. She got into software through her older brother’s influence and early experiments with Myspace layouts, which taught her to break down and rebuild code. Her favorite tool is Obsidian for daily notes, and she uses a refillable notebook to draft ideas before uploading photos to Claude or digital notes. Her advice to ambitious software engineers is to focus on the desire to learn rather than knowing everything, and to avoid comparing one’s journey to others, as unique backgrounds create unique work. ### [The Headless Dashboard Initiative](https://yomu.fyi/post/the-headless-dashboard-initiative.md) - Company: [Resend](https://yomu.fyi/company/resend.md) - Published: Sep 22, 2026 - Type: Announcement Resend announced a headless dashboard initiative to make all dashboard capabilities available programmatically via the MCP, CLI, and API. Recent releases include the Email Metrics API for deliverability and engagement data, a Headless Webhook API for listing events and replaying deliveries, and a Cancel Broadcast API. The Duplicate Broadcast API copies any broadcast into a draft, and the Share Email API provides expiring read-only email links. The team aims to make the dashboard best-in-class while committing to full headless operation for every future entity. Developers can start building today by connecting the MCP server or using the CLI. ### [Welcoming Kiersti Esparza, our new Deliverability Engineer](https://yomu.fyi/post/welcoming-kiersti-esparza-our-new-deliverability-engineer.md) - Company: [Resend](https://yomu.fyi/company/resend.md) - Published: Sep 3, 2026 - Type: Announcement Resend introduces Kiersti Esparza as a Deliverability Engineer on its Trust & Safety Squad, where she will help scale sending infrastructure as the company grows. She brings nearly 20 years in email deliverability, including building teams at Marketo, consulting at Twilio, and deliverability engineering at Klaviyo. Esparza describes the work as a combination of interpreting datasets, understanding email technology, and adapting to evolving authentication in an ongoing contest between bad actors and receivers. She says Resend attracted her with developer-oriented infrastructure, hands-on foundational work, and a culture centered on transparency and partnership, while advising operators to master overlooked infrastructure because its scarcity creates leverage. ### [The Email Verification API](https://yomu.fyi/post/the-email-verification-api.md) - Company: [Resend](https://yomu.fyi/company/resend.md) - Published: Aug 25, 2026 - Type: Tutorial The proposed Email Verification API lets a browser verify that a submitted email address belongs to the user without sending them away from the current form to retrieve an OTP or magic link. Its flow involves the user, browser, mailbox provider (issuer), and application server (verifier): after mailbox registration, the browser and issuer create a token that is submitted with the address and checked server-side. Implementation requires an email input, a hidden email-verification-token input with a session-bound random nonce, and token verification using the site origin as audience; a JavaScript package handles parsing, lookups, and signature checks. The proposal is currently limited to Chrome’s origin trial and Gmail mailbox verification, so the source recommends progressive enhancement and other verification APIs where unavailable. ### [How APRF Helps You Understand Your Email Reputation](https://yomu.fyi/post/how-aprf-helps-you-understand-your-email-reputation.md) - Company: [Resend](https://yomu.fyi/company/resend.md) - Published: Aug 20, 2026 - Type: Explainer Aggregate Performance Reporting (APRF) is a draft standard for email deliverability feedback backed by contributors from Comcast, Google, and Iterable. It gives senders aggregated, intentionally bucketed signals about message classification—such as inbox or unwanted—and user engagement, categorized as positive, negative, or neutral. It also describes daily JSON reports delivered to a DNS-configured address, with provider-specific bucket definitions optionally documented in extra\_info. Senders can configure a TXT record derived from the DKIM selector and domain, then use the optional sdi attribute and email header to segment results by business, region, campaign, or other values. The sample shows separate classification and engagement data for marketing and transactional segments, while acknowledging that counts are approximate; APRF is not yet adopted by an IETF working group, Comcast sends reports, and Gmail does not yet. ### [How to Show Your Logo in Apple Mail](https://yomu.fyi/post/how-to-show-your-logo-in-apple-mail.md) - Company: [Resend](https://yomu.fyi/company/resend.md) - Published: Aug 6, 2026 - Type: Tutorial Displaying a company logo in Apple Mail can improve inbox recognition, trust, and visual distinctiveness, while cited studies associate logos with higher brand recall, open rates, purchase likelihood, and email confidence. The article presents Apple Branded Mail, a proprietary format shipped in iOS 18.2 in 2024, as a free alternative to inconsistent provider settings and the paid certificates and trademarks sometimes needed for broad BIMI coverage. Setup begins with a DMARC policy of p=quarantine or p=reject, then uses Apple Business Connect to add a brand, upload a PNG, HEIF, or JPEG logo at least 1024 × 1024 pixels, select domains, and verify identity. Verification can take up to seven business days; root-domain branding covers unconfigured subdomains, while brands needing broader client coverage are directed to BIMI. ### [Engineering a Vercel Chat Adapter](https://yomu.fyi/post/engineering-a-vercel-chat-adapter.md) - Company: [Resend](https://yomu.fyi/company/resend.md) - Published: Jun 22, 2026 - Type: Explainer Vercel’s Chat SDK supports bots across multiple chat platforms, but those channels can be ephemeral and leave conversations buried in feeds and threads. Email offers a persistent, widely used channel, so Resend built an official adapter that treats email as bidirectional chat. Inbound mail arrives through Resend webhooks and triggers Chat SDK handlers, while outbound messages use the Resend API. The adapter reconstructs threads from In-Reply-To and References headers, tracking message-to-thread mappings in an in-memory Map and generating IDs from the sender address and a SHA-256 prefix of the root Message-ID. It also translates Chat SDK messages, including markdown and CardElement structures, into email HTML and plain-text content through React Email components, trading richer native chat semantics for email’s reach and simpler delivery model. ### [6 Tips for Accessible Emails](https://yomu.fyi/post/6-tips-for-accessible-emails.md) - Company: [Resend](https://yomu.fyi/company/resend.md) - Published: May 28, 2026 - Type: Tutorial The Email Markup Consortium’s 2026 report analyzed 376,348 emails and found that only eight passed every accessibility check, while nearly all failures included Serious or Critical issues. The post focuses on six largely mechanical improvements: setting lang and dir, marking layout tables role=“presentation”, creating a heading hierarchy, writing descriptive link and image text, adding a specific title element, and meeting a 4.5:1 color-contrast ratio. It gives HTML examples, notes that clients may strip attributes from the html element, and distinguishes meaningful images from decorative ones that need empty alt text. It also describes updated React Email defaults for language, direction, image alt text, Markdown tables, and titles, while leaving content judgments such as headings, links, and contrast to authors. ### [Welcoming Michael Vaz, our new Customer Success Engineer](https://yomu.fyi/post/welcoming-michael-vaz-our-new-customer-success-engineer.md) - Company: [Resend](https://yomu.fyi/company/resend.md) - Published: May 21, 2026 - Type: Announcement Resend introduces Michael Vaz as a new Customer Success Engineer based in Portugal, with experience in systems administration, networking, support engineering, cybersecurity, SaaS video, and email-related products. He began in technology by installing, configuring, and maintaining email servers, then developed broader experience at Sophos and Loom, including exposure to SaaS and startup scaling. At Resend, he says he wants to help unblock people, ensure systems work well for customers, and contribute to a product he finds easy to start with and capable of growing with users’ needs. His preferred tools include log platforms such as Datadog, which he describes as a source of truth when diagnosing failures, while his background also shapes a people-centered approach to support and problem-solving. ### [React Email 6.0](https://yomu.fyi/post/react-email-6-0.md) - Company: [Resend](https://yomu.fyi/company/resend.md) - Published: Apr 17, 2026 - Type: Announcement React Email 6.0 announces an open-source visual editor as its centerpiece, available as a standalone package that outputs email-ready HTML for major inbox providers. The editor is built in two layers: a core that works without configuration and a composable API using EmailNode for custom extensions, with optional themes for styling. The release ships new authentication and e-commerce templates from Character Studio, available as React Email templates or Figma files. All components are now unified into a single package except the editor, simplifying imports and reducing package management. The project has reached 2 million weekly downloads, a 108% increase since the last major release five months ago. ### [Resend CLI 2.0](https://yomu.fyi/post/resend-cli-2-0.md) - Company: [Resend](https://yomu.fyi/company/resend.md) - Published: Apr 15, 2026 - Type: Announcement Resend CLI 2.0 gives terminal-based access to the full Resend API and adds four features: sending emails from local React (.tsx/.jsx) files, managing automations and events, one-command webhook listening with automatic tunneling, and Agent Skills for autonomous API interaction. Users can now create automation runs, inspect results, and build multi-step workflows directly from the command line. The webhook listener automatically sets up a tunnel and forwards all event types to a local server, eliminating the need for separate tunneling tools. Agent Skills provide a structured interface enabling AI agents to independently manage their own inbox, sign up for accounts, receive confirmation emails, process attachments, and respond without manual intervention. Other improvements include programmatic log retrieval, enhanced API key storage via the system keychain (macOS Keychain, Linux Secret Storage, Windows Credential Manager), and the deprecation of the team command in favor of auth.