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Oct 19, 2026NewsletterRSS
Isometric illustration of a mailbox with a magnifying glass hovering over a calendar page on a sky blue background

Mailgun's AI Now Explains Why a Day of Email Delivery Went Wrong

Mailgun took AI Insights out of beta for every Optimize plan. It writes a plain-language summary for each of the past seven days.

2 min read

Most popular

  1. ResendLaravel Cloud Apps Can Now Add Resend Without Copying an API Key
  2. Gmail APIGmail's MCP Server Will Reject Any OAuth Client Not Marked Agentic
  3. SuprSendSuprSend Lets Claude and ChatGPT Run Its Notification Workspace
  4. CourierCourier Tells Apps the Moment a User Unsubscribes
  5. AgentMailAgentMail Flags Emails That Try to Hijack an Agent but Blocks None
  6. LoopsLoops Lets Agents Read Campaign Metrics and Work From ChatGPT
  7. BrevoBrevo Lets Servers Swap API Keys for Tokens That Expire in an Hour
Isometric illustration of a small robot mailbox holding a wall calendar with one circled date on a cobalt blue background

AgentMail Gives Every Agent Inbox Its Own Calendar

AgentMail added a calendar to every inbox. Agents can book events, answer emailed invitations and get webhooks when meetings start and end.

AgentMail3 min read

Hand-drawn illustration of a mailbox with a guest list clipboard hanging on its door on a coral red background

Exchange Online Now Blocks EWS Unless Admins Name the Apps

Microsoft began retiring Exchange Web Services in Exchange Online. Tenants need an app allow list from Oct. 10, and EWS shuts off for good Apr. 1, 2027.

Exchange Online3 min read

Isometric illustration of a chat bubble inside a browser window with a small envelope tucked beside it on a yellow background

Novu Gives Its Agents an In-App Chat Channel Beside Email

Novu Connect's Web Chat is in open beta. An agent can now talk to users inside a React app, with the same agent still serving Slack, Teams and email.

Novu2 min read

Hand-drawn illustration of an envelope riding a conveyor belt under a big checkmark stamp on a hot pink background

Customer.io Lets Teams Push Email HTML in and Publish by API

Customer.io's Design Studio API now covers an email's whole life: create from your own HTML, test, link to a workflow and publish. Some limits remain.

Customer.io2 min read

Isometric illustration of a mailbox with a single brass key hanging from its door beside a ring of many unused keys on a lilac purple background

Nylas Lets Agents Hold a Key to One Mailbox Instead of the Whole App

Nylas IAM issues API keys bound to one grant, workspace or application, with roles, expiry and a 400-day audit log of allowed and denied requests.

Nylas3 min read

Hand-drawn illustration of a mailbox with a cracked padlock and a magnifying glass on a green background

KumoMTA Closes Crash and Header Forgery Holes in One Release

KumoMTA 2026.09.29 fixes remotely triggerable crashes and a forged-header flaw, and now drops any log record over 128 MiB by default.

KumoMTA3 min read

Isometric illustration of a mailbox with a metal sieve over its slot on a yellow background

EmailEngine Drops Embeddings and Its Document Store

EmailEngine 2.82.0 removes embeddings generation and the Document Store, and now checks incoming mail in code before its AI features read it.

EmailEngine2 min read

Hand-drawn illustration of a printer with a padlock on its output tray beside a glowing mailbox on a teal background

Amazon SES Shows How to Stop One Bad Sender Sinking an Account

AWS laid out five ways to tag printers and legacy apps with an SES tenant, so one bounce storm can't wreck reputation for every sender on the account.

Amazon SES3 min read

Isometric illustration of a mailbox beside a round gauge dial with the needle near full on an orange background

Resend Lets Apps and Agents Check Their Own Quota in One Call

Resend's new GET /usage endpoint returns plan limits and current usage for email, contacts, domains and AI credits, with a CLI command and an MCP tool.

Resend2 min read

Hand-drawn illustration of a mailbox with a stopwatch beside it on a sky blue background

Nylas Now Returns a 429 When Mail Providers Throttle Sends

Nylas now passes provider rate limits through as a 429 with Retry-After, and no longer reports IMAP throttling as a 504 timeout.

Nylas2 min read

Hand-drawn illustration of a small robot-shaped mailbox taking letters into its intake slot, with a padlock on its outgoing slot on a yellow background

AgentMail Agents Can Now Sign Themselves Up but Can't Send Alone

AgentMail now lets AI agents sign up with no human email and get a receive-only inbox. Five breaking changes shipped in the same two weeks.

AgentMail3 min read

Hand-drawn illustration of a curbside mailbox with its flag down beside a wall calendar with one date circled on an orange background

Azure Email Retires in 2028 With No Microsoft Option for Customer Mail

Microsoft will retire Azure Communication Services Email on Sept. 30, 2028. Its in-house alternative can't send to customers outside a tenant.

Azure Communication Services2 min read

Hand-drawn illustration of a wall of mail slots with one slot taped shut and the rest open on a hot pink background

Cloudflare Stops One Domain's Bounces From Blocking a Whole Account

Cloudflare Email Service now ties bounce and complaint suppressions to the sending domain that caused them instead of the whole account.

Cloudflare Email Service2 min read

Hand-drawn illustration of an envelope, a phone handset and a chat bubble tied together with one piece of string on a teal background

ZeptoMail Becomes Zoho CPaaS as Texting and Voice Join Email

Zoho renamed its ZeptoMail transactional email service Zoho CPaaS and added SMS, WhatsApp and voice. Existing email setups keep working unchanged.

Zoho CPaaS2 min read

Latest

  1. Isometric illustration of a mailbox with a magnifying glass hovering over a calendar page on a sky blue background

    Mailgun's AI Now Explains Why a Day of Email Delivery Went Wrong

  2. Hand-drawn illustration of a mailbox with a plug cable connecting to a small cloud on a coral red background

    Laravel Cloud Apps Can Now Add Resend Without Copying an API Key

  3. Isometric illustration of a mailbox with a small robot badge pinned on its door and a ticket stub beside it on a lime green background

    Gmail's MCP Server Will Reject Any OAuth Client Not Marked Agentic

  4. Hand-drawn illustration of a chat bubble plugged into a notification bell with a padlock on a hot pink background

    SuprSend Lets Claude and ChatGPT Run Its Notification Workspace

  5. Isometric illustration of a light switch flipped to off beside an envelope on a hot pink background

    Courier Tells Apps the Moment a User Unsubscribes

  6. Hand-drawn illustration of a small robot mailbox wearing a knight helmet and holding a shield on a lime green background

    AgentMail Flags Emails That Try to Hijack an Agent but Blocks None

  7. Isometric illustration of a mailbox with a small bar chart flag on its post on a teal background

    Loops Lets Agents Read Campaign Metrics and Work From ChatGPT

  8. Hand-drawn illustration of a brass key with an hourglass standing beside a mailbox on a hot pink background

    Brevo Lets Servers Swap API Keys for Tokens That Expire in an Hour

  9. Isometric illustration of a small robot mailbox holding a wall calendar with one circled date on a cobalt blue background

    AgentMail Gives Every Agent Inbox Its Own Calendar

  10. Hand-drawn illustration of a mailbox with a guest list clipboard hanging on its door on a coral red background

    Exchange Online Now Blocks EWS Unless Admins Name the Apps

  11. Isometric illustration of a chat bubble inside a browser window with a small envelope tucked beside it on a yellow background

    Novu Gives Its Agents an In-App Chat Channel Beside Email

  12. Hand-drawn illustration of an envelope riding a conveyor belt under a big checkmark stamp on a hot pink background

    Customer.io Lets Teams Push Email HTML in and Publish by API

  13. Isometric illustration of a mailbox with a single brass key hanging from its door beside a ring of many unused keys on a lilac purple background

    Nylas Lets Agents Hold a Key to One Mailbox Instead of the Whole App

  14. Hand-drawn illustration of a mailbox with a cracked padlock and a magnifying glass on a green background

    KumoMTA Closes Crash and Header Forgery Holes in One Release

  15. Isometric illustration of a mailbox with a metal sieve over its slot on a yellow background

    EmailEngine Drops Embeddings and Its Document Store

  16. Hand-drawn illustration of a printer with a padlock on its output tray beside a glowing mailbox on a teal background

    Amazon SES Shows How to Stop One Bad Sender Sinking an Account

  17. Isometric illustration of a mailbox beside a round gauge dial with the needle near full on an orange background

    Resend Lets Apps and Agents Check Their Own Quota in One Call

  18. Hand-drawn illustration of a mailbox with a stopwatch beside it on a sky blue background

    Nylas Now Returns a 429 When Mail Providers Throttle Sends

  19. Hand-drawn illustration of a small robot-shaped mailbox taking letters into its intake slot, with a padlock on its outgoing slot on a yellow background

    AgentMail Agents Can Now Sign Themselves Up but Can't Send Alone

  20. Hand-drawn illustration of a curbside mailbox with its flag down beside a wall calendar with one date circled on an orange background

    Azure Email Retires in 2028 With No Microsoft Option for Customer Mail