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Changelogs and bug fixes

Mailgun release notes

The latest news on features and changes to the Mailgun platform.

What's new

Recent release notes

Looking for the latest changes to our API and UI? Our release notes catalog major changes to the application through 2024.

Release notes

JUNE 11, 2024

GZIP compression support for /messages API endpoint

We have released GZIP compression support on our /messages API endpoint. This allows API users to compress their API requests to send messages, thereby reducing network overhead and bandwidth costs.

Release notes

MAY 30, 2024

Role-Based Access Control (RBAC) API Keys

Introducing Role-Based Access Control (RBAC) for API key users.  Previously, RBAC was implemented as a user management feature on our dashboard. Now, the RBAC concept has been applied to new API keys by giving an Admin user the ability to assign a pre-defined role that controls API access at the user level. This reduces the risk of account compromise, and provides more control over what API endpoints users can (and can’t) access.

Release notes

MAY 29, 2024

New Event metric for time to first delivery attempt

We have added a new metric – ‘time_to_deliver_first_attempt’ - to the delivered event representing the time (measured in seconds) from the point Mailgun accepts your message send request to connection to recipient host for email transmission.

Release notes

MAY 28, 2024

New Integrated Product Experience within the UI

We have updated the navigational flow of the Mailgun UI to bring our Optimize and Validate products into a single app experience. This release also includes an in-app walkthrough of new navigation experience.

Release notes

MAY 15, 2024

Introducing Engagement Results

Validations Engagement Results attribute an engagement type to the email address that is validated. Through this, customers can segment their email list(s) based on engagement activity. This activity result is based on the past 30 days of engagement at the time of validation.

Release notes

APRIL 25, 2024

Delegated IP Pools

A primary account can now assign an IP pool from the primary to their subaccounts via the UI and/or API. Alongside this, the IP pool can be allocated to any sending domains on the assigned subaccount(s), as well as allowing for the assignment of the same IP pool to multiple subaccounts.

Release notes

MARCH 6, 2024

Added Mailbox Provider details to the Events and Webhooks payloads

For outbound messages, we added the Mailbox Provider (displayed as recipient provider) to the event webhook payloads as well as the event logs in the Mailgun application. This will allow customers to analyze their sending performance per Mailbox Provider.

Release notes

FEBRUARY 20, 2024

New Documentation Experience

We have updated and modernized our publicly available help and API reference at

Release notes

JANUARY 29, 2024

Subaccount Support in Official SDKs

We have updated our officially supported libraries to include subaccount API operations.

Release notes

JANUARY 25, 2024

Added ARC support to Inbound Messages

We have added ARC headers to all inbound email routed and forwarded by Mailgun. This change was implemented to better align with policy changes at Google and Yahoo.

Also, since we can retain authentication on the forward, DMARC compliance should be retained.

Release notes

DECEMBER 13, 2023

A Subaccount can now send on an IP pool managed by the primary account

We have enhanced the header X-Mailgun-Sending-Ip-Pool to allow a subaccount to send via a primary account-level IP pool. This change was made to support a few different use cases but should remove the burden for primary account users to micro-manage IP allocation on the subaccount level.

Release notes

OCTOBER 23, 2023

New IP Allowlist

Our new IP Allowlist now secures both API and SMTP connections to Mailgun. We have moved the feature into its own navigation item in the settings menu: IP Access Management. Additionally, you are now able to add your own description when creating a new list entry or by updating existing entries.

Release notes

OCTOBER 18, 2023

Global Region Switcher

We have launched a new region switcher in the top navigation of the Mailgun application that quickly and easily allows users to switch between our US and EU region for managing assets.

Release notes

OCTOBER 17, 2023

Reporting Dashboard Enhancements 

For supported plans we have added filters and groupings for both subaccounts and IP Pools.

Release notes

SEPTEMBER 18, 2023

Increased message scheduling window

Mailgun has increased the max scheduling window for messages from 3 to 7 days. The scheduling window is based on the plan's message retention, i.e., Foundation message retention is 1 day, so the max scheduling window is 1 day. Scale message retention is 7 days, so the max scheduling window is 7 days.

Release notes

AUGUST 14, 2023


We have officially released our long-anticipated subaccounts feature. We hope to assist a number of user cases that need self-provision and segment Mailgun accounts based on business unit, email type, or serving your own end-users. Please note that the subaccounts feature is currently reserved for contract customers.

Release notes

AUGUST 10, 2023

API key management update

Mailgun has launched a long-anticipated upgrade to our API key management system that allows the creation of multiple API keys for users who are managing multiple applications. We also upgraded the security of our keys, meaning they will be hashed in our database, and we will be unable to display them in plain text once generated.

Release notes

AUGUST 8, 2023

Accepted Webhook

Mailgun will now push an event data payload to your URL when Mailgun accepts the request to send/forward the email and the message has been placed in queue.

Release notes

JULY 31, 2023

Mailgun Shared IPs Now Dynamically Assigned

We have implemented changes to affect how Mailgun shared IPs are allocated to sending domains. When a sending domain is only using shared IPs, these IPs are no longer explicitly assigned to the sending domain. The sending domain will use shared IPs designated at send time. As such, the UI will not show explicitly assigned shared IPs. 

Release notes

JULY 14, 2023

Allow for tracking pixel to be placed at top of email

We have added the option to place a tracking pixel at top of email. This is to assist senders that may be sending large emails that are only being partially rendered/displayed at the recipient causing inaccurate engagement rates when tracking pixel is by default located at the bottom of messages.

See our documentation on the setting as well as an API reference on the new parameter.

Release notes

JULY 6, 2023

DKIM Keys management

We've launched the ability to manage up to 3 active DKIM keys for a sending domain which will allow a user to manually rotate their DKIM key, or upgrade their key(s) from 1024 bit to 2048 bit keys without having to delete and re-add a domain. See our Help Article here: How do I rotate my DKIM key? or our API docs at Domains — Mailgun API documentation for more information.

Release notes

JUNE 12, 2023

Updates to Templates

We've added the following updates to our Templates offering:

  • Ability to store headers (Subject, From-address, Reply-to address) directly on a template, which will allow you to send a message providing just the recipient and template name.

  • Removed limitations in template name that prevented the use of capital letters, spaces and special characters (template name is now encoded)

  • Fixed an issue where templates that included some Handlebars helpers were not rendering in the Mailgun application.

Release notes

JUNE 5, 2023

Support for EUR & GBP

Mailgun has released support for payment using EUR and GBP currencies. This will allow new users signing up to choose their preferred currency (USD, EUR, GBP) for billing purposes.

Release notes

MAY 22, 2023

IP Pools UI Update

We've released the ability to view and manage linked domains on the Edit IP Pools modal located at

Release notes

MAY 11, 2023

'HTMLonly' option for open tracking retired

Mailgun has retired the 'htmlonly' open tracking setting and has removed the option from our API and application. This was a legacy setting that had low adoption and should have an extremely low impact on customers.

Release notes

APRIL 20, 2023

Get IP Pool details API call

We released a small update to our /ip_pools endpoint to allow a user to issue a GET call to<pool_id> to be able to retrieve information about the IP Pool such as which IPs and domains are associated with that IP Pool, along with the usual name and description.

Release notes

APRIL 18, 2023

Manually input SMTP Password via UI

UI updated to support manual creation of SMTP password when creating a new credential or resetting password for SMTP login previously created. While it is recommended to use the more secure, auto-generated password, some use cases needed the character count of the password to be shorter.

Release notes

MARCH 20, 2023

Logs UI fix

Fixed Resend message modal from Logs page to pre-populate original recipient address. Removed non-relevant placeholder text.

Release notes

FEBRUARY 1, 2023

STO available at no additional charge

Mailgun’s Send-time Optimization solution is now free to all Scale and above plans.

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