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MDaemon 20.0.4 – Mail Server

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MDaemon 20.0.4 – Mail Server

MDaemon is a reliable and secure mail server that does not require expensive administration or impose high per-user costs. It simplifies messaging and collaboration requirements with an intuitive, user-friendly design. It offers the enterprise-class features that can be managed with minimal training and support.

Messaging Server supports IMAP, SMTP, and POP3 protocols and delivers solid performance from its feature-rich and user-friendly design.

It is a trusted alternative to Microsoft Exchange. The Server provides outstanding groupware features, integration with Microsoft Outlook (using Outlook Connector for MDaemon) and a multi-language webmail client for email access anywhere.

MDaemon works with many popular mobile devices. Regardless of platform, you will have access to your important information wherever you are.

The integrated email message archiving capabilities make it easy to safeguard your email messages to address regulatory requirements and the IT policies of your business.

MDaemon incorporates multiple layers of security techniques such as Relay Controls, IP Shielding, SMTP Authentication. Furthermore, it reverse lookups to minimize possible server exploits. It also uses the advanced email authentication techniques of Vouch By Reference (VBR). Validates and signs messages using DKIM, DK, Sender-ID, and SPF.

This server is combined with its antispam engine, Bayesian Learning, SSL/TSL, backscatter protection, and SecurityPlus for proactive malware prevention. As result, it provides layered protection to safeguard your messaging communications.

MDaemon Features:

  • Easy Setup, Administration, and Maintenance
  • Powerful Mail List Engine
  • Public Folder Ticketing System
  • Active Directory Monitoring
  • WorldClient (Web-Based Email)
  • Remote Administration
  • WorldClient Instant Messenger
  • Microsoft Outlook Integration (Outlook Connector)
  • Powerful Spam Filter
  • Backscatter Protection
  • Hijacked Account Detection
  • Supports Popular Smartphone Mobile Devices
  • ActiveSync for MDaemon
  • Mobile Device Management for IT Policies

MDaemon allows you to encrypt your emails and attachments. On the client-side, WorldClient users can enable basic encryption features when sending emails and attachments within the WorldClient settings menu. On the server-side, Open PGP for MDaemon has been added to give administrators the ability to use encryption, decryption, and basic key management capabilities through OpenPGP support.

Changes in MDaemon 20.0.4 – January 12, 2021:


  • [24322] fix to MDRA vulnerability that may allow remote code execution
  • [24323] fix to security vulnerability in MDRA
  • [24324] fix to Webmail cross-site scripting vulnerability
  • [24325] fix to security vulnerability in Webmail
  • [24258] fix to possible MDaemon.exe crash when using POP3 with SSL
  • [24211] fix to possible crash in WorldClient.dll
  • [24342] fix to potential security vulnerability

Changes in MDaemon 20.0.3 – October 20, 2020:


  • [24113] MDaemon will comment out the line “AlertExceedsMax yes” in ClamAV’s clamd.conf due to it causing too many “Heuristics.Limits.Exceeded” AV scan failures.


  • [24032] fix to possible crash in MDASMgmt.dll
  • [24025] fix to possible crash in AclShlFx.dll
  • [24093] fix to possible crash in MDAirSync.dll
  • [24057] fix to possible crash in CFilter.dll
  • [24053] fix to possible crash in WorldClient.dll
  • [24109] fix to possible crash in WCXMPPServer.exe
  • [23867] fix to MDaemon may not authenticate to a smart host when sending a message with a route slip
  • [24107] fix to $CLIENTSIGNATURE$ macro does not work for a domain-level client signature
  • [24022] fix to ActiveSync – CPU usage spikes when syncing a particular message
  • [24110] fix to ActiveSync – HTML message formatting is lost on Windows Mail
  • [24121] fix to ActiveSync – members are removed from distribution lists

Changes in MDaemon 20.0.2 – September 22, 2020:

  • [10307] fix to Webmail – compose text may have the wrong font size in Firefox
  • [23858] fix to ActiveSync – high CPU and memory usage when syncing particular HTML messages
  • [23928] fix to ActiveSync – error when accessing shared mail folders
  • [23932] fix to MDRA – possible crash
  • [23908] fix to Gateway Manager does not save changes after the first time Apply is clicked
  • [23816] fix to Content Filter – HDR files not being deleted from CFilter\Temp automatically
  • [23886] fix to Content Filter/AV/Spam Filter activities possibly not being logged on 64-bit installs
  • [23889] fix to Outbreak Protection – MDOP header not being added to message before being moved to quarantine folder
  • [23959] fix to distribution list/contact group downloaded via CardDAV is not displayed correctly in eM Client

Changes in MDaemon 20.0.1 – August 18, 2020:


  • [23267] MDRA – Added the X-MDaemon-Deliver-To default header condition to Content Filter rule editor.
  • [23369] Mobile theme – Added mini calendar in the left menu for jumping to dates.
  • [23371] Mobile theme – Added side by side calendars for desktop sizes.
  • [23387] Mobile theme – Added the ability to play audio file attachments in the message view.
  • [23388] Mobile theme – Added ability to import an S/MIME certificate to a contact from a signed message.
  • [23377] WorldClient and Mobile themes – Changed the “change password” page that shows up after login to highlight the Current Password.
  • [23239] WorldClient and Mobile themes – Added the ability for users to view the password that they are typing as a means to confirm for themselves that they are typing it correctly.
  • [23490] MDRA – Darkened the background color of the primary navigation menu to increase the contrast between it and the secondary menu.
  • [23559] MDRA – Added an option to enable/disable the ability for users to view the password that they are typing under Main | Webmail Settings | Settings and Domain Manager | Edit | Webmail Settings.
  • [23574] Clustering – When clustering is enabled MDaemon writes the machine’s FQDN to the Received header instead of the domain’s FQDN. The machine name is also included in the Subject of Queue Summary emails.
  • [22627] DNS lookups using EDNS0 that fail with an “incorrect packet format” error are now retried without EDNS0. After enough of these failures, EDNS0 will be disabled.
  • [23492] The VBR certification host “” has been deprecated and removed from VBR settings.
  • [22765] Antivirus – In Quarantine Queue, attachments that cannot be scanned or detected as containing macro will show “WARNING! attachment cannot be scanned ($ATTACHMENTFILENAME$)” and “WARNING! macro detected ($ATTACHMENTFILENAME$)”.
  • [23101] The default permissions for a domain’s public contacts folders is now read-only instead of read/write. Existing permissions are not changed though so check the permissions on your folders and adjust them to your liking.
  • [23663] When creating a new mailing list “Allow subscription requests” is disabled by default.
  • [23789] ClamAV – Updated to version 0.102.4.


  • [23113] fix to Mobile theme – translations are not working in the calendar view
  • [23186] fix to Mobile theme – “Back” navigation always takes users to the first page
  • [22959] fix to Mobile theme – When using IIS, inline images do not show up in messages or drafts
  • [23270] fix to LookOut theme – Settings pages are missing their titles
  • [23397] fix to Webmail – If a user enters an optional password that is too long for a published calendar the request will not complete in a timely fashion
  • [23399] fix to Antivirus – will now report ClamAV “Heuristics.Limits.Exceeded” as non-scan instead of a virus
  • [23403] fix to SMTP screening logging saying “Dynamic screening”
  • [23407] fix to Mobile theme – Unable to save start/end time values after editing autresponder
  • [23167] fix to MDMigrator – Unable to import more than a single alias
  • [23488] fix to Task Due Date set to a day in the future when using CalDAV Synchronizer
  • [23491] fix to MDRA – Recipient Blacklist editor does not add items correctly if there’s an entry with unmatched double quotes
  • [23509] fix to Mobile theme – Contacts list stuck loading when all contacts selected
  • [23554] fix to Mobile theme – date picker calendar not translated
  • [23561] fix to Webmail – MDPGP results string has HTML tags enclosing the key id
  • [23549] fix to Webmail – MDPGP options – subject may be overridden incorrectly
  • [23545] fix to Outlook task assignment messages are corrupted by winmail.dat attachment extraction
  • [23567] fix to MDRA – missing radio button at Security | AntiVirus | AntiVirus
  • [23560] fix to MDRA – Dropbox Integration settings not saving
  • [23432] fix to SSL/TLS session resumption does not work
  • [23579] fix to meeting organizer’s calendar item loses formatting and hyperlinks when an attendee accepts the meeting request
  • [23596] fix to Mobile theme – Password Recovery screen will not allow password to be changed
  • [21016] fix to Webmail – attachment filenames encoded according to RFC 2231 are not decoded
  • [23601] fix to Mobile theme – From select field is missing in the Compose view
  • [23600] fix to Mobile theme – Dates typed into date entry field revert to the previous value
  • [23609] fix to Webmail – possible crash when importing iCalendar file into calendar
  • [23633] fix to Dynamic Screening notifications about IPs blocked by SMTP Screen that are already on the blacklist
  • [23626] fix to possible MDaemon.exe crash when generating DMARC aggregate reports
  • [23635] fix to possible crash in WorldClient.dll
  • [22290] fix to Webmail – When forwarding certain messages, cke_protected is added to the body
  • [23648] fix to Webmail – Share Folder option missing when user has admin permissions but not edit permissions
  • [23657] fix to deleted account may reappear in GroupWareUsers.dat when enabling MDaemon Connector for another account
  • [23634] fix to MDRA – Location Screening – Unable to save Whitelist entries since Save button is unavailable
  • [23573] fix to Mobile theme – Email templates show up with \\ at the end of each line
  • [18461] fix to tray icon problems with config session – also added a ‘Reset Tray Icon’ to tray and Help menus which will stop the flashing and return status message to normal
  • [23678] fix to the default domain’s IP is used for all other domains
  • [23676] fix to Mobile theme – User experience – Nothing to indicate that you have to enter your current password when changing the recovery email address
  • [23677] fix to Mobile theme – Sign In button is not enabled until the password meets minimum length requirements
  • [23686] fix to Mobile theme – Calendar list view is not translated
  • [23685] fix to MDRA – The forwarding address field’s max length is only 72 characters
  • [23673] fix to Mobile theme – Forgot password page has “null” in the email address field
  • [23451] fix to content filter possibly causing a message to go missing
  • [23670] fix to messages in the Deferred queue with no To header are moved to the Bad queue
  • [23654] fix to SPF “Maximum number of ‘void’ lookups” setting may not work properly
  • [22815] fix to AV Updater proxy settings not written to freshclam.conf
  • [23715] fix to AD Monitoring – A change in an AD account causes MultiPOP or Forwarding to be disabled
  • [23730] fix to AD Monitoring issues when accounts are removed from a group
  • [23717] fix to folder permissions may be changed when exporting to public address book
  • [23688] fix to clustering replication may fail due to an unexpected error
  • [23656] fix to Webmail – XSS vulnerabilities
  • [23776] fix to MDRA – Domain missing in Domain Manager for domain admins
  • [23777] fix to Webmail – Edge reveal icon displayed next to Webmail reveal icon in password fields
  • [23780] fix to Mobile theme – Columns settings page may not load
  • [23502] fix to XMPP server – server not sending user’s presence back to them
  • [23660] fix to non-ASCII characters in account administrator notes may be corrupted
  • [23805] fix to possible crash in WorldClient.dll
  • [23800] fix to ASMC – Mail item Add operations overwrite previously added message files
  • [23786] fix to default autoresponder text (OutOfOffice.rsp) is not translated
  • [23844] fix to contact and calendar items may fail to sync to the Outlook mobile app

Changes in MDaemon 19.5.5 – March 23, 2020:


  • [23335] fix to Webmail – XSS vulnerabilities
  • [22769] fix to CalDAV – Potential memory corruption and crash

Changes in MDaemon 19.5.4 – February 4, 2020:


  • [22865] fix to ActiveSync – Possible server crash
  • [22837] fix to ActiveSync – PIM item changes from one client are not synchronized to other clients
  • [22930] fix to ActiveSync – Server may shut down after several weeks of uptime
  • [22907] fix to ActiveSync – Slow performance loading very large SYNCMAP files
  • [22998] fix to ActiveSync – Calendar sync not working properly with Outlook mobile app
  • [22769] fix to CalDAV – Potential memory corruption and crash
  • [23002] fix to CalDAV – Crash when synchronizing IMAP folder with very long path on disk
  • [22810] fix to Mobile theme – When spell check is enabled, replies and forwarded messages are not sent
  • [22968] fix to Mobile theme – No login page shows up on iOS 10
  • [22498] fix to Mobile theme – IE/Edge compose being restricted to width of unexpanded HTML compose toolbar
  • [22789] fix to Mobile theme – Searching for UTF8 characters fails to show expected results
  • [22737] fix to MDRA – Unable to select a Default Type on the settings tab when editing a mailing list
  • [23005] fix to MDRA – Deadlock may occur
  • [22825] fix to MDRA – Existing domain signatures are not displayed
  • [23027] fix to MDaemon GUI – Possible crash when clicking Edit on the ActiveSync Client Settings screen

Changes in MDaemon 19.5.3 – December 12, 2019 :


[16456] Hosted email options with MDaemon Private Cloud are now available.


[22772] fix to MDaemon service may hang at startup and prevent other services from starting

Changes in MDaemon 19.5.1 – November 4, 2019:


[16456] Hosted email options with MDaemon Private Cloud are now available. To learn more, please visit:

[22444] The LetsEncrypt functionality has been updated to use ACME v2. This update is required because LetsEncrypt is discontinuing support for ACME v1. PowerShell 5.1 and .Net Framework 4.7.2 are now required in order to use LetsEncrypt.


  • [22433] fix to ActiveSync – clients that required previous approval need to be re-approved
  • [22443] fix to ActiveSync – Unable to login when using domain and full email address
  • [22446] fix to Mobile theme – Sending plain text emails results in an empty message body
  • [22439] fix to Mobile theme – Cannot download attachments in folders other than Inbox
  • [22467] fix to Mobile theme – Cannot add inline images to a new message
  • [22472] fix to Webmail – Images in the default client signature may not be displayed in Webmail
  • [22474] fix to MDRA – When adding an image to a Default Client Signature, the image file is placed on the root of the C drive
  • [22486] fix to licensed features may be disabled after renewing an MDaemon registration key that had been switched to trial mode
  • [22372] fix to memory leak in DAV server if folder contains over 1000 events or contacts

Homepage –

MDaemon Email Server – Minimum System Requirements:

MDaemon is available as a 32 or 64 bit application.

  • Microsoft Windows 2019|10|2016|8|2012|7|2008 (Limited support of XP and 2003)
  • CPU 800 MHz processor or higher (dual core CPU 2.4 GHz or higher recommended)
  • 512 MB RAM (1 GB RAM recommended)
  • Typical Hard disk space required: 200MB of free space, additional space for any mail to be stored
  • TCP/IP network protocol installed
  • Internet or Intranet communication capabilities

Size: 276 MB

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