The settings at Setup|Preferences|Miscellaenous to copy all system generated postmaster notifications to global admins and domain admins now apply to more notifications, such as Account Freeze and Disable, No Such User, Disk Error, Low Disk Space, and Beta and AV expiration. If you do not feel it appropriate for your administrators to receive these notifications you must disable these settings.
 The network resource access settings at Setup | Preferences | Windows Service now configure the MDaemon service (and the Remote Administration and XMPP Server services) to run as the specified account, instead of MDaemon running as SYSTEM and then it running specific processes and threads as that account. The installer will update the services to run as the specified account when updating to this version.
 Because of changes to and deprecation of many settings in clamd.conf, the installer will now overwrite existing clamd.conf. If you have customized your clamd.conf you may need to review and make changes to clamd.conf after installation.
 Please carefully read the section in the full release notes labeled as task  as it involves changes to the Active Directory integration system and you may find things that were broken in the past now starting to work. Please be aware of all changes made in that area and carefully read that section of these release notes.
 MDaemon 20.0 requires Windows 7, Server 2008 R2, or newer.
 Setup|Preferences|Miscellaneous has two new checkboxes that control whether system generated notification emails periodically sent to the Postmaster alias should also be sent to Global and Domain level administrators. By default, these options are both enabled. Domain administrators are restricted to receiving only those emails which are for their domain and the Release Notes. Global administrators receive everything including the Queue Summary report, Statistics report, Release Notes, 'No Such User' found (for all domains), Disk Error notifications, Account Freeze and Disable notifications for all domains (which, like Domain admins, they can unfreeze and re-enable), warnings about licenses and beta test versions about to expire, Spam Summary reports, and perhaps others as well. If you do not feel it appropriate for your administrators to receive these notifications you must disable these settings.
 How autoresponders are stored has changed. The text for an accounts autoresponder is now stored as OOF.MRK within the account's DATA folder which is a new sub-folder inside the account's root mail folder. Autoresponder script files are no longer kept in the APP folder and they are not shared between accounts. When MDaemon starts for the first time it will migrate all existing autoresponder files and settings to the correct places for every account. The AUTORESP.DAT file is obsolete and will be deleted along with every account specific .RSP file (OutOfOffice.RSP and non-account specific files will remain for reference and sample purposes). If you wish to quickly assign a single autoresponder configuration to multiple accounts you can use the new Publish button found at Account Editor|Account Settings|Autoresponder. This button will copy the existing autoresponder script text and all settings for the current account to other accounts that you select. There is also a button at Accounts|Account Settings|Autoresponders|Settings that lets you edit the default autoresponder script (OutOfOffice.rsp). This default is copied into an accounts OOF.MRK if the OOF.MRK is missing or empty.
 How account signature files are stored has changed. Signature files are now stored as SIGNATURE.MRK within the account's DATA folder which is a new sub-folder inside the account's root mail folder. When MDaemon starts for the first time it will migrate all existing signature files to the correct places for every account. The root MDaemon Signatures folder will no longer contain account specific signature files however it remains in place as it may still contain items needed by WebAdmin and the Content Filter. The original Signatures folder was backed up to \Backup\20.0.0a\Signatures\ prior to migration. Finally, every account's ADMINNOTES.MRK has been moved from the account's root mail folder to the new DATA sub-folder.
 Security|Spam Filter|White List (automatic) has had the default value changed to disabled for the option '...only whitelist addresses that authenticate using DKIM'. Having this enabled turns out to be a little restrictive for many and prevents address book whitelisting from working for MultiPOP and DomainPOP mail. Re-enable the setting if this is not to your liking.
 Setup|Preferences|UI 'Center all UI dialogs' has been reset to a default of 'enabled' for everybody. If you prefer otherwise you can disable it. This prevents screens from being created partially out of frame (which is better IMO) but it also makes multiple overlapping screens harder to select at times.
 Security|Security Manager|Screening|Location Screening - The default for this feature has been changed from disabled to enabled. When Location Screening is enabled the connecting country/region will always be logged (if known) even when the particular country/region is not being actively blocked. So, even if you do not wish to block any country you can still enable Location Screening (without selecting any countries to block) so that country/region can be shown and logged. Since the default setting for this has changed upgraders should take a look at their Location Screening configuration for correctness. MDaemon will insert the header 'X-MDOrigin-Country' that lists the country and region for content filtering or other purposes.
 The hard-coded fixed size limit of 2 MB for spam filter scans has been removed. There is now no theoretical limit to the size of a message that can be spam scanned. It is still possible to configure your own limit in case this is a problem but configuring 0 (zero) now means no limit. Additionally, the size limit has been converted from KB to MB and your existing value has been automatically converted or set to zero. You should check it at Security|Spam Filter|Settings and make sure this value is set how you want.
 Added 'Sender Domain' and 'Recipient Domain' columns to the Queues screens in the main UI. As a result of this a one-time reset of saved column widths had to be done. Once you set the column widths to your liking they will be remembered.
 By default now the Host Screen is applied to MSA connections. You can disable this at Security|Security Manager|Screening|Host Screen if you like.
 By default MDaemon IMAP, WebMail, and ActiveSync servers no longer provide access to the shared folders of disabled accounts. You can change this with a new settings at Setup|Server Settings|Public & Shared Folders.
 Some settings, such as the registration keys, have been moved from \MDaemon\App\MDaemon.ini to \MDaemon\LocalData\LocalData.ini. If you need to revert to a previous version, they will not find the settings at their new locations, so their installers will ask you to enter a registration key. This can be avoided by copying the settings back to MDaemon.ini, or restoring a backup of MDaemon.ini, first.
 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.
 The "Max RSET commands allowed" options at F2|Server Settings|Servers have been removed since they are essentially less flexible duplicates of the same functionality found at Ctrl+S|Screening|SMTP Screen. The SMTP Screen version is part of the Dynamic Screening system which takes into account more factors (ie..has a white list, considers authentication status, etc). Your old values from the F2|Server Settings|Servers settings have been moved to the SMTP Screen. Please check Ctrl+S|Screening|SMTP Screen to make sure the values there are as you expect. Correct defaults (and recommended) are 20 for the RSET maximum and "Close SMTP session after blocking IP" should be checked/enabled.
 BlackBerry Internet Service feature integration has been deprecated and removed. The BIS service (if it still exists) will now interact with MDaemon as it would any other SMTP/IMAP server.
 WAB functionality has been deprecated and removed from Ctrl+U|Other.
 Alt-N Technologies has changed its name to MDaemon Technologies. WorldClient is now MDaemon Webmail, WorldClient Instant Messenger is now MDaemon Instant Messenger, SecurityPlus is now MDaemon Antivirus, and Outlook Connector is now MDaemon Connector.
 The "From Header Modification" feature has changed. It operates as before however the format of the final modified From data has changed from this format: "Email -- Name" <Email> to this format: "Name (Email)" <Email>. This new format is more readable/usable/sortable etc. If you would rather keep the old format (your users may be used to it already) you can check a box at Ctrl+S|Screening|Hijack Detection|From Header Modification.
 A past installer reset the option "Ctrl+S|Sender Authentication|SMTP Authentication|Authentication is always required when mail is sent from local IPs" to disabled for upgraders. The installer has been changed to ignore this setting. You must manually check that this option is set to your desire. The default is for it to be checked (enabled) but you should check to be sure it is set how you want.
 The following settings have had default values changed. Existing installations should check to be sure the following settings are as desired: Ctrl+S|Security Settings|SSL & TLS|MDaemon: Enable the dedicated SSL ports... and SMTP server requires STARTTLS... options have had defaults changed from disabled to enabled. Ctrl+S|Security Settings|Sender Authentication|DMARC verification|Honor p=reject... has changed from disabled to enabled. Ctrl+S| Security Settings|Sender Authentication|SPF Verification|User local address in SMTP envelope...has changed from disabled to enabled. Ctrl+S|Security Settings| Screening|IP Screen|Apply IP Screen to MSA connections has changed from disabled to enabled. Ctrl+S|Security Settings|Screening|Host Screen|Drop connection after EHLO has changed from disabled to enabled.
 Catalog functionality has been deprecated and removed from the UI.
 All Virtru related support has been removed from MDaemon Webmail. Old encrypted messages can still be viewed in the Virtru Secure Reader.
 Previously when a message was sent to an alias, MDPGP would encrypt it using the key for the actual email address. Now that same message won't be encrypted. To encrypt it now requires a key for the alias.
Outlook Connector has been updated to version 3.5.0. Please see what changed in Outlook Connector 3.5 here:
Outlook Connector has been updated to version 3.0.0. Please see what changed in Outlook Connector 3.0 here: