September 2025 Summaries

Sender reputation is a crucial factor in determining whether emails from your domain are delivered to recipients' inboxes or marked as spam, with algorithms from email service providers (ESPs) and mailbox providers (MBPs) evaluating factors such as list quality, spam complaints, and email engagement rates. Improving sender reputation involves maintaining clean, segmented recipient lists to avoid hard and soft bounces, minimizing spam complaints by ensuring recipients have consented to receive emails, and effectively managing email frequency and content relevance. Monitoring open rates is also essential, as low engagement can negatively influence sender reputation, creating a feedback loop that impacts both delivery and open rates. Implementing and properly configuring DMARC policies is vital for authenticating emails and preventing phishing attacks, though overly strict settings can inadvertently harm sender reputation by blocking legitimate emails. By addressing common pitfalls and continuously optimizing email strategies, businesses can enhance their sender reputation, improve email deliverability, and increase engagement rates.

Model Context Protocol (MCP) enhances the functionality of AI agents by allowing them to interact with tools in a more deterministic manner, driven by human creativity and exploration. The Resend MCP Hackathon invites developers and creators to showcase their innovations using the Resend MCP server, requiring submissions to include sending an email via this server. Participants must share their work on social media, tagging Resend and using the hashtag #ResendMCPHackathon, with entries due by October 1, 2025. The top three submissions will be featured on Resend's blog and social media, with the first-place winner receiving AirPods Pro 3. The Resend MCP server supports various email functionalities, including sending plain text and HTML emails, scheduling deliveries, and customizing sender addresses, with further guidance available through documentation and video tutorials.

Christina Martinez is joining the Resend team as a Developer Experience Engineer, bringing with her a passion for coding that began unexpectedly while working in marketing at a tech company. Her journey into software development started with a Codecademy course and evolved into a full-time role in product development. Christina is inspired by whimsical and fun software projects, valuing creativity and joy in coding as a form of "magic power." Her previous experience includes creating content for Resend's .NET SDK, which sparked her interest in the company. Beyond software, she enjoys frequenting her local library's maker space and has a fondness for travel, particularly to Spain where she once lived and ran a personal training gym. Her advice to fellow software engineers is to embrace looking silly as a learning opportunity, fostering an environment where admitting one's lack of knowledge can lead to collective growth.

DMARC, which stands for Domain-based Message Authentication, Reporting & Conformance, is a crucial protocol for preventing email spoofing by providing insights into email authentication. It operates as a DNS record that enhances domain security and delivers detailed reports about email activity, allowing domain owners to monitor and protect against unauthorized use. DMARC reports come in two forms: forensic (RUF) and aggregate (RUA), with RUA being recommended for regular monitoring due to its comprehensive overview of email authentication patterns. These reports help identify authentication gaps, sending patterns, and potential security threats by detailing the status of each email against SPF and DKIM checks. Reading these reports requires understanding XML data, which can illuminate email handling outcomes like delivery, spam, or rejection based on the DMARC policy. Analyzing these patterns aids in taking corrective actions to improve email deliverability and security, making DMARC a pivotal part of any email strategy.

Resend has experienced significant growth, doubling its team size in the past six months and onboarding nearly 100 new customers daily, prompting the appointment of Erin Levine as the new Chief of Staff. Levine, who has a background in anthropology and experience with startups, is tasked with helping Resend scale while maintaining its culture and enhancing operations. Her career began in IT consulting, where she discovered a passion for building company culture, leading her to Resend due to its alignment with her values of ownership, transparency, and people-focused solutions. Levine finds inspiration in outdoor activities and values resources like Open Org for its community-driven, transparent approach to operations. She advises ambitious software engineers to build resilience, seek diverse learning opportunities, and engage deeply with product and business outcomes.