## Please enable JavaScript to view this site.

# MDaemon Email Server 26.0

- Zoom Window Out
- Larger Text | Smaller Text
- Hide Page Header
- Show Expanding Text
- Printable Version
- Save Permalink URL

MDaemon 26.0 Release Notes | Scroll Prev Top Next More

MDaemon Server Release Notes

# MDaemon Server v26.0 Release Notes

## MDaemon 26.0.0 - 2026-03-17

### CHANGES AND NEW FEATURES

#### MDAEMON SERVER

- [24064] MDaemon sets the service recovery options for the MDaemon, Remote Administration, and XMPP Server services if no actions have already been configured for them.
- [28080] MDaemon's "Filter messages which fail the DMARC test into spam folders" is now enabled by default on new installs. Consider enabling it if you're updating from a previous version.
- [28993] Added "domain" to the default Host Screen entries

#### REMOTE ADMINISTRATION

- [13008] Added a Rejected Inbound page at Reports | Traffic, and a sortable and searchable page for the MDaemon Statistics log at Logs | Statistics Log
- [28976] Added the domain name to all domain manager title bars
- [29256] Added "Block Sender when moving mail into Junk-Email folder" to MDRA in ActiveSync Client Settings

#### WEBMAIL

- [13436] Webmail now supports Single Sign On using OpenID Connect (OIDC). Instead of signing in to Webmail with their MDaemon email address and password, users can use the Sign In with SSO button to sign in to an OIDC identity provider. Webmail will then sign them in to the MDaemon account associated with their identity provider account.

  To set this up, first create an app using your identity provider's management interface. You will need to provide Webmail's Redirect URI. Then configure Webmail's OIDC settings page. Enable OIDC, enter your provider's Issuer URL, the app's Client ID and Secret, and any other settings that are necessary.

  Webmail needs to know which MDaemon account each account on the identity provider will sign in to. Configure the identity provider to send the user's MDaemon email address as a claim (making sure users cannot set or change the value themselves, or they'll be able to get into someone else's email). Or configure Webmail with the unique identifier of each user (for example, using the "sub" or "oid" claim) and which MDaemon account to sign in to.

- [28848] Added join links that are created for external users when they are invited to a conference. Changed the invitation feature to use the contact picker.
- [28720] New conference invitations are now sent to a user's MDIM in addition to a user's email
- [28870] Added the ability to resize the attendees list during a conference
- [28846] Added a refresh button and refresh timer to the Pro theme's Calendar view. The refresh timer is off by default and can be set at Settings | Calendar.
- [7229] Added the ability to customize the work week hours shown in the Pro theme's Calendar view at Settings | Calendar
- [29010] Reduced the size of the external windows being opened in the Pro theme
- [28465] Added the ability to record conferences
- [28467] Added the ability to transfer files through Web Conferences
- [29062] Incremented the OpenAI model from gpt-4o-mini to gpt-5.1
- [29132] Added the user message quotas to the Pro theme's navigation bar
- [29147] Pro theme - Added the ability to set the nickname of a favorited folder
- [25275] MDaemon will disable Webmail's Standard theme, if it's still installed, by moving it to \MDaemon\WorldClient\Old. It has been obsolete and unsupported for many years.

#### WEB CONFERENCE SERVER

- [29188] Web Conference - Upgraded RTCServer.exe from node 22.21.1 to 22.22.0

#### OTHER

- [29076] MDaemon GUI - Renamed the "Trusted Hosts" dialog to "Trusted Domains". The values here are compared to the domain in MAIL FROM commands, not the FQDN in HELO/EHLO commands. Use with care and do not make a domain trusted unless you know you need to do so.
- [29121] LetsEncrypt - Allow ECDSA certificates to be used in production
- [29194] MDMigrator - Added search filter to mailbox selection page to filter by name or email address
- [29236] MDMigrator - Non-ASCII characters in mailbox and full name fields are now converted using ActiveDS.dat character mappings
- [21792] Content Filter - Added restricted attachment exclusions by sender and recipient.
- [29214] ActiveSync - The "Block Sender when moving mail into Junk-Email folder" option is now disabled by default. Previous versions enabled itfor the "WindowsMail" and "WindowsOutlook15" client types. Disable it if it's causing problems for your Outlook users.
- [29215] ActiveSync - When the server blocks an address due to "Block Sender when moving mail into Junk-Email folder", it is noted in the AirSync log and in the newly created contact.
- [28932] Updated SpamAssassin to 4.0.2.
- [29111] MDaemon Connector has been updated to version 8.0.3.

### FIXES

- [29331] fix to Dynamic Screening - connections from blocked IP may occasionally be accepted
- [29011] fix to Content Filter - X-CFilter-Restricted-Files header not added to messages that contain restricted attachments
- [29318] fix to MDMigrator - draft messages from non-English Drafts folders being saved to Inbox
- [29336] fix to Webmail - If there's an external calendar import error, the external calendar gets removed and so do all the events associated with it
- [29273] fix to Content Filter - certain restricted attachments might not be blocked
- [29269] fix to XMLAPI - query for MaxDiskSpace returns wrong value if account quota is 2+ GB
- [29280] fix to MDMigrator - Migration log window scrolls back to the top when new log entries are added
- [29282] fix to ActiveSync - possible crash handling Sync command
- [29184] fix to Web Conference - Chat message times appear out of order due to sent time on local machines
- [29191] fix to MDaemon - Remote queue stops processing if the POP3 ports are set to 0
- [29195] fix to Dynamic Screening - IP address is not added to block list if Location Screening is configured to block its country but is turned off
- [29204] fix to MDRA - Account Manager takes 4-5 minutes to load a large number of users
- [29198] fix to MDRA - When entering an App Password name and hitting "Enter", getting error: Exception: Form Field [Name] Not found
- [29211] fix to Pro theme - When HTML Compose is disabled, replying to a message adds &gt; prefix to message body text
- [29218] fix to ActiveSync - Categories may be removed from a message when it's moved to another folder
- [29219] fix to MDRA and Webmail - 2FA login no longer works after the user's mailbox has been moved to a different path on the server
- [29205] fix to ActiveSync - Meeting invitation's HTML body is not displayed on iOS Mail
- [29238] fix to MDRA - Multiple search settings info graphics may be created if settings update takes a while
- [29239] fix to AutoDiscover - MDDP server refuses app passwords
- [29247] fix to Webmail - Non-ASCII characters in user's full name are corrupted in Two Factor Auth verification code email
- [29255] fix to MDRA - ActiveSync Client Type Management list is empty
- [29126] fix to MD GUI - Invalid characters allowed when naming DKIM selector
- [29074] fix to ActiveSync - Date header missing in ActiveSync Client Approval Required notifications
- [29145] fix to MDMigrator - Not detecting accounts from all domains in multi-domain Exchange environments
- [29144] fix to Content Filter - The font-family property of the HTML is broken when adding a particular signature to a message
- [29163] fix to MDRA - possible crash when user's login history is corrupted
- [29154] fix to Pro theme - autoresponder start and end times can get set to 00:00 when the dates are in the past
- [29170] fix to Pro theme - In the compose view, if there is an image in the user's signature downloading an uploaded attachment results in the signature image being downloaded instead
- [29181] fix to MDRA - Host Authentication - Cannot add a hostname containing a number
- [29136] fix to Content Filter - Adding header to message with attachment may break its DKIM signature
- [29139] fix to MD GUI - Non-ASCII characters in the default spam folder name are not encoded
- [29183] fix to Pro theme - When HideWhiteListFolder and HideBlackListFolder are set to Yes under Default:UserDefaults, those folders are still visible
- [29140] fix to Spam Filter - DQS HashBL queries are still performed after disabling DQS
- [9777] fix to Webmail - \" sequences in email from header are not unescaped
- [12451] fix to Pro theme - Unable to see or select a contact's addresses with read only access to the folder
- [28987] fix to WorldClient theme - Dropbox fails to load in the documents view if the description column is on
- [28986] fix to Pro theme - save attachment to Dropbox button not working in the external message view
- [28988] fix to Pro theme - No Dropbox, Google Drive, or OneDrive folders are displayed when in the Documents view
- [20644] fix to MDRA - When attempting to login to a disabled or frozen account with a valid password, the error shown is ambiguous
- [22043] fix to MDRA - When "Remove contacts which are missing name or phone data" has a failed user, the error message starts with %USER% instead of the user address
- [28978] fix to Webmail - If an external calendar has no events, then Webmail returns an error when trying to add it
- [28989] fix to Pro theme - Message list context menu extends beyond the bottom of the page for messages close to the bottom
- [28977] fix to Webmail - Edited response to meeting requests from a single recurring event are blank
- [27705] fix to WorldClient theme - When you click a contact's phone number in the reading pane, it displays an error screen
- [25282] fix to MDRA - templates other than New Accounts have the option to enable MDaemon Connector access
- [26699] fix to MDRA - ActiveSync Groups menu always states "No" for Settings Defined column
- [25747] fix to Passwords can contain the full name when spaces are removed
- [28998] fix to Pro theme - Calendar color not being set when creating a new calendar on the Settings | Folders page
- [28991] fix to ActiveSync - possible crash in MdXml.dll
- [21052] fix to broken links in NewUserHelp.dat (the welcome message)
- [29000] fix to Crash in webadmin.exe when using "Remove contacts which are missing name or phone data"
- [29060] fix to MDRA - Custom links are not saved in some non-English languages
- [29087] fix to Pro theme - New Password and Confirm New Password fields uppercase the first letter of each new word
- [29089] fix to Outbreak Protection - incorrect logging when processing is skipped because AntiSpam is disabled

MDaemon is a registered trademark of MDaemon Technologies, Ltd.
Copyright ©1996-2026 MDaemon Technologies, Ltd.

MDaemon v26.0.0 - March 2026. Copyright © 1996-2026. All rights reserved. MDaemon Technologies