Live · Updated Weekly
The definitive record of the email industry
ESP acquisitions, RFC standards, deliverability shifts, privacy laws, mailbox provider policies. Every event that shaped email — in one living timeline.
61+
Events Tracked
7
Categories
24+
Years of History
39
High-Impact Events
2026
Microsoft Relaunches SNDS Portal and Restructures JMRP; Legacy URLs Deprecated June 22
Microsoft migrated its Smart Network Data Services (SNDS) reputation portal to a new address on June 8, 2026, adding a REST API, 30-day expiring access links, and a 10-month network ownership renewal …
AI Email Agents Become Standard ESP Features — The Automation Layer Matures
By mid-2026, virtually every major ESP — Klaviyo, Brevo, Mailchimp, HubSpot, ActiveCampaign, Iterable — had shipped AI-native email features: subject line generation, send-time optimization, automated…
EU AI Act Provisions Hit Marketing Automation — Email Senders Must Comply
Key EU AI Act provisions activating in January 2026 brought AI-powered email personalization, predictive segmentation, and automated targeting under new transparency and documentation obligations, par…
2025
Gmail Escalates Enforcement — Non-Compliant Traffic Faces Permanent Rejections
Starting November 2025, Google ramped up enforcement against senders who failed to meet its 2024 bulk sender requirements. For the first time, non-compliant messages began receiving permanent rejectio…
Bird (Formerly MessageBird) Cuts 120 Jobs in Strategic Realignment — SparkPost Lives On as Bird Email
Bird, the communications platform formed from MessageBird's February 2024 rebrand, announced a 120-person layoff in February 2025 as part of a 'strategic realignment.' The cuts affected primarily sale…
Brevo Surpasses 500,000 Active Customers — Largest European ESP Milestone
Brevo (formerly Sendinblue) announced crossing 500,000 active customers, fueled primarily by Mailchimp migrations and dominant European market share. The milestone cemented Brevo as the primary Europe…
Microsoft Enforces DMARC for Outlook.com Consumer — The Trifecta Is Complete
Microsoft began enforcing DMARC policy for Outlook.com consumer inbound mail, completing the alignment of all three major Western inbox providers. Combined with Gmail and Yahoo, senders without DMARC …
2024
Yahoo Launches Revamped Sender Hub with Enhanced Deliverability Tooling
Yahoo introduced an updated Sender Hub portal with improved feedback loop management, complaint rate data, and configuration tools. The revamped portal reflected Yahoo's renewed commitment to sender t…
ConvertKit Officially Rebrands to Kit — Creator Economy Platform Signals Broader Ambitions
ConvertKit, the email platform built for bloggers and content creators, rebranded to 'Kit' to signal its expansion as a full creator economy platform. The rebrand came with new commerce tools and crea…
Google Begins Active Enforcement of Bulk Sender Requirements — Error Codes and Rejections Ramp Up
Google's phased enforcement of its February 2024 bulk sender requirements accelerated in June 2024, with error codes 4.7.x and 5.7.x becoming live for authentication failures, missing PTR records, and…
Google Explores HubSpot Acquisition — $30B+ Deal Collapses Under Scrutiny
Bloomberg reported in April 2024 that Alphabet (Google) was in exploratory talks to acquire HubSpot for a deal that would have exceeded $30 billion. The talks ultimately dissolved — reportedly due to …
Gmail One-Click Unsubscribe Grace Period Ends — RFC 8058 Now Mandatory for All Bulk Senders
Google's June 1, 2024 deadline passed, requiring all bulk senders sending marketing or promotional messages to implement RFC 8058 one-click unsubscribe via List-Unsubscribe headers. Senders who had ex…
Gmail Spam Rate Enforcement Hardens — 0.3% Threshold Triggers Mitigation Ineligibility
Starting June 2024, Google made it official: bulk senders with a user-reported spam rate above 0.3% in Postmaster Tools are ineligible for Gmail delivery mitigations. Senders must sustain spam rates b…
Beehiiv Raises $33M Series B — Newsletter Platform Boom Peaks
Beehiiv, the newsletter-first publishing platform founded by former Morning Brew engineers, raised a $33M Series B as competition in the creator newsletter space intensified. The round validated the n…
Klaviyo Reports $698M Revenue for 2023 — Email's E-Commerce Crown Confirmed
Klaviyo reported full-year 2023 revenue of $698M following its September 2023 IPO, underlining email's continued dominance as the highest-ROI channel for direct-to-consumer brands and validating behav…
Gmail Postmaster Tools Gets Compliance Status Dashboard for Bulk Sender Requirements
Google added a new Compliance Status Dashboard to Gmail Postmaster Tools, giving bulk senders a centralized view of their compliance with the February 2024 sender requirements. The dashboard shows aut…
Microsoft Updates SNDS — Smart Network Data Services Migrates to New Portal URL
Microsoft migrated its Smart Network Data Services (SNDS) tool to a new portal URL under the Microsoft 365 admin infrastructure, retiring the legacy postmaster.live.com/snds endpoint. Senders relying …
Salesforce Restructures Marketing Cloud — Einstein AI Rebranding and Product Consolidation
Salesforce continued restructuring its Marketing Cloud product line in 2024, consolidating legacy ExactTarget infrastructure, rebranding its AI features under the Einstein umbrella, and launching Mark…
Gmail & Yahoo Enforce Mandatory Bulk Sender Requirements — The Industry Shifts
On February 1, 2024, Google and Yahoo enforced new requirements for bulk senders: mandatory SPF, DKIM, and DMARC authentication; one-click unsubscribe (RFC 8058); and spam rate thresholds below 0.3%. …
2023
Gmail Officially Adds TLS Encryption as Explicit Sender Requirement
Google formally added 'Use a TLS connection for transmitting email' to its sender requirements table in December 2023, preceding the February 2024 bulk sender mandate. This codified what had been best…
CM Group Rebrands as Marigold — Campaign Monitor, Sailthru, Selligent Unite
CM Group consolidated its portfolio of email and CRM platforms — Campaign Monitor, Sailthru, Selligent, and others — under the unified Marigold brand, creating one of the most significant mid-market e…
Google & Yahoo Announce 2024 Bulk Sender Requirements — 90-Day Warning
Google and Yahoo simultaneously published new sender requirements giving bulk senders a 90-day runway before February 2024 enforcement. The coordinated joint announcement sent shockwaves through the i…
BIMI Achieves Mainstream Adoption — Gmail, Yahoo, and Apple Mail All Support Brand Logos
By late 2023, BIMI (Brand Indicators for Message Identification) had achieved widespread mailbox provider support across Gmail (since 2021), Yahoo (since 2021), Apple Mail (since 2022), and Fastmail —…
India's DPDP Act Signed — 1.4 Billion People Get Data Protection Rights
India's Digital Personal Data Protection (DPDP) Act was signed into law in August 2023, establishing the first comprehensive federal data protection framework for the world's most populous country. Fo…
Mailchimp Restructures Pricing — Free Tier Gutted, Migration Wave Begins
Mailchimp substantially restructured pricing tiers under Intuit ownership, restricting features previously available on the free plan. The changes prompted significant user backlash and a visible migr…
Sendinblue Rebrands to Brevo — European ESP Stakes Its Global Identity
Sendinblue, the Paris-based email and marketing platform with over 500,000 customers, rebranded to Brevo — signaling its ambition to compete globally rather than being perceived as a European-only alt…
Sinch Rebrands Mailgun and Mailjet Under Sinch Email — Cloud Communications Consolidation
Sinch, which acquired Pathwire (parent of Mailgun and Mailjet) in 2021, consolidated both email platforms under the Sinch Email umbrella. The rebrand reflected Sinch's strategy to unify its cloud comm…
2022
Apple Launches BIMI Support in iOS 16 — Brand Logos Arrive in Apple Mail
Apple shipped BIMI support in iOS 16 and macOS Ventura (September 2022), enabling brands with DMARC enforcement and a Verified Mark Certificate (VMC) to display their logo next to the sender name in A…
ActiveCampaign Acquires Postmark (Wildbit) — Transactional + Marketing Email Converge
ActiveCampaign completed its acquisition of Wildbit, the company behind Postmark — the developer-beloved transactional email service known for exceptional deliverability and customer support. The acqu…
Spamhaus Transitions to Authenticated DQS API — Free Public DNS Queries Restricted
Spamhaus completed its transition to a paid Data Query Service (DQS) API for commercial users, restricting free unauthenticated DNS-based blocklist queries. Organizations using Spamhaus data in commer…
2021
Apple Mail Privacy Protection Blindsides Email Marketers — Open Rates Become Noise
Apple's iOS 15 and macOS Monterey introduced Mail Privacy Protection (MPP), pre-fetching email content through Apple's servers and rendering open-rate tracking unreliable. Overnight, email's primary K…
Intuit Acquires Mailchimp for $12 Billion — Largest Email Marketing Deal Ever
Intuit announced the acquisition of Mailchimp for approximately $12 billion, the largest acquisition in Mailchimp's history and among the largest in email marketing. The deal brought the world's bigge…
Apollo Global Acquires Yahoo & AOL from Verizon for $5 Billion — Verizon Media Exits
Apollo Global Management completed its acquisition of Verizon Media (the combined Yahoo/AOL portfolio) for approximately $5 billion, rebranding the entity back to Yahoo Inc. The deal ended Verizon's s…
MessageBird Acquires SparkPost for $600M — Transactional Email Heats Up
MessageBird acquired SparkPost — handling over 4 trillion emails per year — in a deal reportedly valued at $600 million. SparkPost was later rebranded as Bird as part of MessageBird's broader transfor…
Gmail Launches BIMI Support — Brand Logos Appear in Inbox for First Time
Google launched BIMI (Brand Indicators for Message Identification) support at Gmail, enabling brands with DMARC enforcement and a Verified Mark Certificate to display their logo directly in Gmail's in…
2020
Brazil LGPD Takes Effect — South America's GDPR Reshapes Email Marketing
Brazil's Lei Geral de Proteção de Dados (LGPD) came into force in September 2020, establishing a comprehensive personal data protection framework modeled on GDPR. For email senders with Brazilian subs…
Return Path and 250ok Merge Under Validity — Deliverability Data Empire Forms
Validity acquired 250ok (a leading email analytics platform), integrating it with Return Path (acquired in 2019) to create a comprehensive email deliverability and sender intelligence platform. The co…
CCPA Takes Effect — California Becomes America's De Facto Privacy Regulator
The California Consumer Privacy Act (CCPA) took effect on January 1, 2020, giving California residents rights to know, delete, and opt out of the sale of their personal information. For email marketer…
2019
ARC RFC 8617 Published — Email Forwarding's DMARC Problem Gets a Fix
The IETF published RFC 8617, standardizing ARC (Authenticated Received Chain). ARC solved email forwarding's DMARC incompatibility: when messages pass through intermediaries like mailing lists, DMARC …
Google AMP for Email Goes GA at Gmail — Interactive Emails Become Real
Google made AMP for Email generally available in Gmail, enabling senders to include interactive, dynamic content in emails — forms, carousels, accordions — that update without requiring the recipient …
Twilio Acquires SendGrid for $2 Billion — Developer Email Gets a Powerhouse Owner
Twilio completed its acquisition of SendGrid for approximately $2 billion in an all-stock deal, creating the largest developer communications platform in the world. The combined entity served over 1.5…
2018
Adobe Acquires Marketo for $4.75 Billion — Marketing Automation Gets an Enterprise Home
Adobe completed its acquisition of Marketo for $4.75 billion, integrating one of the world's leading B2B marketing automation platforms into the Adobe Experience Cloud. The deal signaled enterprise ma…
GDPR Enforcement Begins — Email Marketing's Consent Paradigm Rewrites Itself
The EU General Data Protection Regulation became enforceable on May 25, 2018, fundamentally reshaping how companies collect, store, and use email addresses. Opt-in requirements tightened dramatically,…
DKIM RFC 8301 Updates Cryptographic Requirements — SHA-1 Phased Out
RFC 8301 updated DKIM's cryptographic requirements, deprecating SHA-1 signatures and requiring RSA keys of at least 1024 bits (with 2048 bits recommended). The update addressed long-standing security …
2017
Verizon Completes Yahoo Acquisition — Oath Launches, Combines Yahoo and AOL
Verizon completed its $4.48 billion acquisition of Yahoo's core internet business and immediately combined it with AOL (acquired in 2015) under the 'Oath' brand. The combined entity owned Yahoo Mail, …
2016
Voilà.fr Email Service Shuts Down — Orange Consolidates French Mailboxes
Orange France shut down the Voilà.fr email service, migrating remaining users to Orange.fr or advising them to move to alternative providers. Voilà had been one of the largest French web portals and e…
2015
Google Launches Postmaster Tools — Gmail Opens the Deliverability Black Box
Google launched Postmaster Tools, giving bulk email senders access to domain reputation, spam rate metrics, delivery errors, and authentication statistics from Gmail's perspective. For the first time,…
Verizon Acquires AOL for $4.4 Billion — AOL Mail Enters Telecom's Orbit
Verizon acquired AOL for $4.4 billion, bringing AOL Mail — once the defining email experience for millions of Americans — under telecom ownership. The deal was driven primarily by AOL's digital advert…
DMARC RFC 7489 Published — Anti-Spoofing Standard Gets Official IETF Status
The IETF published RFC 7489, officially standardizing DMARC (Domain-based Message Authentication, Reporting, and Conformance). DMARC had been operationally deployed since 2012, but the RFC cemented it…
2014
Canada's CASL Takes Force — Strictest Commercial Email Law in North America
Canada's Anti-Spam Legislation (CASL) came into force requiring express consent before sending commercial electronic messages. With fines up to CAD $10 million per violation, CASL became the strictest…
SPF RFC 7208 Published — Updated Standard Replaces RFC 4408
The IETF published RFC 7208, updating and officially obsoleting RFC 4408 as the specification for Sender Policy Framework (SPF). The update clarified ambiguities in the original RFC, tightened the pro…
Oracle Acquires Responsys for $1.5 Billion — Enterprise Email Stack Consolidates
Oracle completed its acquisition of Responsys for $1.5 billion, bringing the B2C marketing automation platform under the Oracle Marketing Cloud umbrella alongside Eloqua (acquired in 2012). The combin…
2013
Gmail Begins Proxying All Email Images — Tracking Pixels Hit by Caching
Google announced Gmail would proxy all email images through its own servers, caching them rather than serving from sender infrastructure. The change immediately affected open-rate tracking accuracy, g…
Salesforce Acquires ExactTarget for $2.5 Billion — Salesforce Marketing Cloud Born
Salesforce completed its $2.5 billion acquisition of ExactTarget, the Fortune 500 email platform of choice, forming the foundation of Salesforce Marketing Cloud and triggering a wave of enterprise mar…
Gmail Tabbed Inbox Launches — Promotional Email Gets Its Own Silo
Gmail launched tabbed inbox sorting, automatically routing email into Primary, Social, Promotions, Updates, and Forums tabs. Promotional email was siloed into a lower-engagement tab, triggering years …
Oracle Acquires Eloqua for $871 Million — Enterprise Marketing Automation Consolidates
Oracle acquired Eloqua for $871 million, firing the starting gun on the great marketing automation consolidation wave. Within two years, Oracle would also acquire Responsys, Salesforce would buy Exact…
2012
Microsoft Launches Outlook.com — Hotmail's 16-Year Run Ends
Microsoft launched Outlook.com as the modern successor to Hotmail, migrating one of the world's oldest free webmail services to new infrastructure. The migration affected hundreds of millions of accou…
DMARC Consortium Publishes First Draft — Google, Yahoo, Microsoft Align on Anti-Phishing
A 15-organization consortium including Google, Microsoft, Yahoo, Facebook, PayPal, and Bank of America published the first DMARC specification draft — an unprecedented alignment of competing inbox pro…
2011
DKIM RFC 6376 Published — Updated Email Signing Standard Matures
RFC 6376 updated and obsoleted the original DKIM RFC 4871, codifying DomainKeys Identified Mail as a mature widely-deployed standard. The update refined the specification based on years of operational…
2006
SPF RFC 4408 Published — Sender Policy Framework Becomes an Official Standard
The IETF published RFC 4408, standardizing SPF (Sender Policy Framework). SPF enabled domain owners to specify which mail servers were authorized to send on their behalf via DNS TXT records, providing…
2003
CAN-SPAM Act Signed Into US Law — First Federal Standard for Commercial Email
President Bush signed the CAN-SPAM Act, establishing the US's first national standard for commercial email with opt-out requirements, deceptive header prohibitions, and physical address disclosures. W…