--- title: MDaemon Email Server | Knowledge Base Home description: MDaemon Email Server --- [Skip to content](https://knowledge.mdaemon.com/mdaemon-email-server#main-content) [![](https://knowledge.mdaemon.com/hs-fs/hubfs/MDaemon-Technologies_logo.png?width=200&height=150&name=MDaemon-Technologies_logo.png)](https://mdaemon.com/) - [Knowledge Base Home](https://knowledge.mdaemon.com/) - [Go to www.mdaemon.com](https://mdaemon.com/) Open main navigation Close main navigation - [Knowledge Base Home](https://knowledge.mdaemon.com/) - [Go to www.mdaemon.com](https://mdaemon.com/) - [Contact Us](https://mdaemon.com/pages/contact-us) [Contact Us](https://mdaemon.com/pages/contact-us) Knowledge Base - There are no suggestions because the search field is empty. 1. [Knowledge Base Home](https://knowledge.mdaemon.com/) 2. [MDaemon Email Server](https://knowledge.mdaemon.com/mdaemon-email-server) # MDaemon Email Server - [How to configure Webmail to give users the ability to mark messages as Spam or Not Spam](https://knowledge.mdaemon.com/webmail-spam-ham-buttons) - [What does the Error Code 4 that I got during MDaemon installation or activation mean?](https://knowledge.mdaemon.com/what-is-error-code-4) - [How to sync contacts to Thunderbird](https://knowledge.mdaemon.com/sync-contacts-thunderbird-carddav) - [How do I configure SMTP Authentication on the MDaemon server and Outlook mail client?](https://knowledge.mdaemon.com/configuring-smtp-authentication-on-the-mdaemon-server-and-outlook-mail-client) - [How do I enable and configure SSL & TLS for SMTP, POP3, and IMAP in MDaemon](https://knowledge.mdaemon.com/how-to-enable-configure-ssl-tls-for-smtp-pop3-imap-in-mdaemon) - [How do I get a free SSL certificate from Let's Encrypt?](https://knowledge.mdaemon.com/how-to-generate-a-free-ssl-certificate-using-lets-encrypt) - [How do I sync contacts, calendars, and tasks using eM Client via CalDAV/CardDAV/WebDAV?](https://knowledge.mdaemon.com/how-to-sync-contacts-calendars-and-tasks-using-em-client-via-caldav/carddav/webdav) - [What ports need to be open for MDaemon to communicate through a firewall?](https://knowledge.mdaemon.com/what-ports-need-to-be-open-for-mdaemon-to-communicate-through-a-firewall) - [How do I create a CSR and import a third-party SSL certificate for MDaemon or Security Gateway using Certreq?](https://knowledge.mdaemon.com/how-to-create-a-csr-and-import-a-third-party-ssl-certificate-for-mdaemon-using-certreq) - [How do I backup and restore MDaemon?](https://knowledge.mdaemon.com/how-to-backup-and-restore-mdaemon) - [How do I generate a link to a MDaemon Webmail calendar that anyone can view?](https://knowledge.mdaemon.com/how-mdaemon-webmail-users-can-generate-a-link-to-a-calendar-that-anyone-can-view) - [How do I enable DKIM signing and configure primary and additional domain records?](https://knowledge.mdaemon.com/configure-dkim-signing) - [How do I store mailbox passwords using non-reversible encryption?](https://knowledge.mdaemon.com/how-to-store-mailbox-passwords-using-non-reversible-encryption) - [How do I enable DMARC and configure records?](https://knowledge.mdaemon.com/how-to-enable-dmarc-and-configure-records) - [How to sync calendars and tasks in Thunderbird](https://knowledge.mdaemon.com/sync-contacts-tasks-thunderbird-carddav) - [How can I block incoming connections based on geographical location?](https://knowledge.mdaemon.com/how-to-block-incoming-connections-based-on-geographical-location-location-screening) - [What are the recommended Security, Dynamic Screening, Spam Filter, and AntiVirus Settings in MDaemon?](https://knowledge.mdaemon.com/recommended-security-dynamic-screening-spam-filter-anti-virus-settings) - [How do I upgrade to the 64-bit version of MDaemon?](https://knowledge.mdaemon.com/how-to-upgrade-to-the-64-bit-version-of-mdaemon) - [How do I upload custom images for Webmail?](https://knowledge.mdaemon.com/how-to-upload-custom-images-for-webmail) - [How do I bind Webmail to additional IP addresses and ports?](https://knowledge.mdaemon.com/how-to-bind-webmail-to-additional-ip-addresses-and-ports) - [How do I configure customized scores for SpamAssassin rules?](https://knowledge.mdaemon.com/how-to-configure-customized-scores-for-spam-assassin-rules) - [How do I migrate from Microsoft Exchange to MDaemon?](https://knowledge.mdaemon.com/migrating-from-microsoft-exchange-to-mdaemon) - [How do I setup the Auto-Discover Service and create SRV/CNAME records for the service?](https://knowledge.mdaemon.com/how-to-setup-the-auto-discover-service-and-create-srv/cname-records-for-the-service) - [How do I sync calendars and tasks to an iOS device using CalDAV?](https://knowledge.mdaemon.com/how-to-sync-calendars-and-tasks-to-an-ios-device-using-caldav) - [How do I configure Thunderbird to sync contacts using CardBook?](https://knowledge.mdaemon.com/sync-contacts-thunderbird-cardbook) - [How do I access MDaemon Webmail from a mobile device browser?](https://knowledge.mdaemon.com/how-to-access-mdaemon-webmail-from-a-mobile-device-browser) - [How do I sync MDaemon contacts to iOS devices via CardDAV?](https://knowledge.mdaemon.com/how-to-sync-contacts-to-ios-devices-via-carddav) - [What are the recommended Host Screen settings for MDaemon?](https://knowledge.mdaemon.com/what-are-the-recommended-host-screen-settings-for-mdaemon) - [How do I configure MDaemon and Microsoft 365 to use the same domain name?](https://knowledge.mdaemon.com/configure-mdaemon-microsoft-365-to-use-the-same-domain-name) - [How to allow multiple POP3 clients to access an account simultaneously](https://knowledge.mdaemon.com/how-to-allow-multiple-pop3-clients-to-access-an-account-simultaneously) - [How to create a customized 'Help' response for Webmail login failures](https://knowledge.mdaemon.com/how-to-create-a-customized-help-response-for-webmail-login-failures) - [How to use Active Directory to create/update MDaemon accounts and/or public address book(s)](https://knowledge.mdaemon.com/active-directory-mdaemon) - [How to use MDaemon Pro Theme when running Webmail in IIS](https://knowledge.mdaemon.com/mdaemon-19.5-and-above-how-to-use-the-mobile-theme-when-running-webmail-in-iis) - [How to route outbound mail globally or per domain to a specific smart host/server](https://knowledge.mdaemon.com/how-to-route-outbound-mail-to-smart-host) - [How to usee BCC Headers in MDaemon](https://knowledge.mdaemon.com/bcc-headers-in-mdaemon) - [How to specify host names, IP addresses, and 'Mail From' addresses that must use STARTTLS to send and receive mail in MDaemon](https://knowledge.mdaemon.com/how-to-specify-host-names-ip-addresses-and-mail-from-addresses-that-must-use-starttls-to-send-and-receive-mail-in-mdaemon) - [What are the recommended HTTP Response Headers?](https://knowledge.mdaemon.com/recommended-http-response-headers) - [How to include an image in a Webmail signature](https://knowledge.mdaemon.com/how-to-include-an-image-in-a-webmail-signature) - [How to setup Mail Transfer Agent Strict Transport Security (MTA-STS) in MDaemon](https://knowledge.mdaemon.com/setup-mta-sts-in-mdaemon) - [How to read Windows Socket (Winsock) Error Codes and Descriptions](https://knowledge.mdaemon.com/windows-socket-winsock-error-codes-and-descriptions) - [How to sync contacts to the macOS Contacts application using CardDAV](https://knowledge.mdaemon.com/macos-sync-contacts-carddav) - [How to create macro supported, global, per domain, and/or client signatures](https://knowledge.mdaemon.com/how-to-apply-a-plain-text-or-html-signature-globally-or-per-domain) - [How to enable and use MDaemon's Message Recall feature](https://knowledge.mdaemon.com/mdaemon-message-recall) - [How to promote a MDaemon account to a list administrator to manage a mailing list in Remote Administration](https://knowledge.mdaemon.com/promote-a-mdaemon-account-to-a-list-administrator) - [How to enable and setup Password Recovery in Webmail](https://knowledge.mdaemon.com/webmail-password-recovery) - [How to prepend a tag to the beginning of a header using the Content Filter](https://knowledge.mdaemon.com/how-to-prepend-a-tag-to-the-beginning-of-a-header-using-the-content-filter) - [MDaemon Semaphore file use and descriptions](https://knowledge.mdaemon.com/mdaemon-semaphore-files) - [How to extract attachments from messages that contain Winmail.dat files](https://knowledge.mdaemon.com/how-to-extract-attachments-from-messages-that-contain-winmail.dat-files) - [How to create and configure Groups and Templates in MDaemon](https://knowledge.mdaemon.com/mdaemon-groups-and-templates) - [How to connect to MDaemon's Free/Busy service in Outlook](https://knowledge.mdaemon.com/connecting-to-mdaemons-free/busy-service-in-outlook) - [How to create a SMTP Bounce address for MDaemon Mailing Lists](https://knowledge.mdaemon.com/how-to-create-a-smtp-bounce-address-for-mdaemon-mailing-lists) - [Configuring user, domain, and postmaster aliases in MDaemon](https://knowledge.mdaemon.com/mdaemon-aliases) - [How to disable Webmail notifications in Chrome, Firefox, and/or Safari](https://knowledge.mdaemon.com/how-to-disable-webmail-notifications) - [How to use the MDaemon or SecurityGateway Let's Encrypt script when a space exists in the directory path](https://knowledge.mdaemon.com/how-to-use-mdaemons-lets-encrypt-script-when-a-space-exists-in-the-mdaemon-directory-path) - [How to move MDaemon's users and/or mail data to a new directory path with DirReorg](https://knowledge.mdaemon.com/move-mdaemon-users-with-dirreorg) - [How to enable dark mode for Webmail's Pro theme and/or Remote Administration](https://knowledge.mdaemon.com/webmail-mdra-dark-mode) - [How to change the default From and/or Reply-To addresses per user in Webmail](https://knowledge.mdaemon.com/how-to-change-the-default-from-and/or-reply-to-addresses-per-user-in-webmail) - [How to enable and create App Passwords in MDaemon and Remote Administration](https://knowledge.mdaemon.com/app-passwords) - [How to use CSV fields when importing contacts to Webmail](https://knowledge.mdaemon.com/csv-fields-importing-contacts-to-webmail) - [How to unsubscribe from folders to increase user performance in Webmail and ActiveSync clients](https://knowledge.mdaemon.com/unsubscribe-from-webmail-folders) - [How to import accounts from a csv file to MDaemon's account database](https://knowledge.mdaemon.com/importing-accounts-from-a-csv-file-to-mdaemon) - [Resolving issues with MDMigrator and versions of Outlook installed using Click-to-Run](https://knowledge.mdaemon.com/mdmigrator-outlook-click-to-run) - [How to adjust the amount of RAM the MDSpamD process uses](https://knowledge.mdaemon.com/how-to-adjust-the-amount-of-ram-the-mdspamd-process-uses) - [How to override default Webmail properties and settings to increase performance](https://knowledge.mdaemon.com/webmail-override-default-user-settings) - [How do I enable two-factor authentication for Webmail/Remote Administration?](https://knowledge.mdaemon.com/enable-two-factor-authentication-webmail-remote-administration) - [How to enable Hijack Detection to prevent server abuse from compromised accounts](https://knowledge.mdaemon.com/how-to-enable-hijack-detection) - [How to create App Passwords in Webmail](https://knowledge.mdaemon.com/create-app-passwords-in-webmail) - [Using MDaemon's IP Shield to prevent unauthorized SMTP sessions](https://knowledge.mdaemon.com/using-mdaemon-ip-shield) - [How to require STARTTLS connections for defined host names, IP addresses, and email senders](https://knowledge.mdaemon.com/how-to-require-starttls-connections) - [How to determine the number of spam and non-spam messages Bayesian Filter has learned](https://knowledge.mdaemon.com/determine-messages-the-bayesian-filter-has-learned) - [How to setup OneDrive integration for Webmail users](https://knowledge.mdaemon.com/mdaemon-one-drive-setup) - [How do I create a read-only copy of a calendar in iCal/webdav format?](https://knowledge.mdaemon.com/create-read-only-copy-of-a-calendar) - [How do I create and edit user permissions for Public Folders?](https://knowledge.mdaemon.com/user-permissions-for-public-folders) - [How do I change the default Start MDaemon shortcut action?](https://knowledge.mdaemon.com/change-default-start-mdaemon-shortcut-action) - [How to move MDaemon to a new server or OS using the same directory path](https://knowledge.mdaemon.com/move-mdaemon-using-the-same-directory-path) - [How to move MDaemon to a new server or OS using a different directory path](https://knowledge.mdaemon.com/move-mdaemon-using-different-directory-path) - [How do I enable and setup Dropbox integration and utilize Dropbox features in Webmail?](https://knowledge.mdaemon.com/dropbox-setup) - [How do I stop and restart MDaemon Email service?](https://knowledge.mdaemon.com/stop-restart-mdaemon-service) - [MDaemon's Userlist.dat account database file format](https://knowledge.mdaemon.com/mdaemon-userlist-database-format) - [How to setup and modify HTTP Strict Transport Security (HSTS) in MDaemon for Webmail and Remote Administration](https://knowledge.mdaemon.com/setup-hsts-webmail-remote-admin) - [How do I place a new order with MDaemon Technologies?](https://knowledge.mdaemon.com/how-to-place-new-mdaemon-order) - [How do I configure and use the Email Archiving feature in MDaemon Email?](https://knowledge.mdaemon.com/how-to-configure-and-use-the-email-archiving-feature-in-mdaemon-email) - [How do I access the Service Portal?](https://knowledge.mdaemon.com/how-do-i-access-the-service-portal) - [How do I check for compromised passwords in MDaemon Email?](https://knowledge.mdaemon.com/how-do-i-check-for-compromised-passwords-in-mdaemon-email) - [How can I use From Header Screening to expose spoofed email?](https://knowledge.mdaemon.com/from-header-screening-configuration) - [How to downgrade to a previous version of MDaemon](https://knowledge.mdaemon.com/downgrade-to-a-previous-version-of-mdaemon) - [How to enable MDaemon PGP, configure who can use MDPGP, and create keys for specific users](https://knowledge.mdaemon.com/enable-and-configure-mdaemon-pgp) - [Creating, using, and managing categories in Webmail](https://knowledge.mdaemon.com/creating-using-and-managing-categories-in-webmail) - [How to setup Webmail, Remote Administration, ActiveSync, CalDav, CardDav, AutoDiscover, MDDP, Webmail API, and XML API services in IIS](https://knowledge.mdaemon.com/setup-mdaemon-iis) - [MDaemon Clustering - Deployment requirements and how to configure nodes](https://knowledge.mdaemon.com/mdaemon-clustering) - [How to automatically remove or move messages from MDaemon user folders (Junk E-Mail, Deleted Items, etc...) using Account Prune](https://knowledge.mdaemon.com/mdaemon-accountprune) - [How to configure user passwords to expire after X number of days](https://knowledge.mdaemon.com/how-to-configure-user-passwords-to-expire-after-x-number-of-days) - [How to create a customized 'Help' response for Webmail login failures](https://knowledge.mdaemon.com/customized-help-response-for-webmail) - [Configuring MDaemon's Attachment Linking feature for inbound or outbound messages](https://knowledge.mdaemon.com/configure-attachment-linking) - [How to temporarily hide messages in Webmail using MDaemon's Email Snooze feature](https://knowledge.mdaemon.com/mdaemon-email-snooze) - [How to activate MDaemon connecting through proxy server](https://knowledge.mdaemon.com/activate-mdaemon-proxy) - [How to collect hang dumps to send to Technical Support](https://knowledge.mdaemon.com/how-to-collect-hang-dumps) - [How to integrate Google Drive access in MDaemon Webmail](https://knowledge.mdaemon.com/mdaemon-google-drive-setup) - [How to setup MultiPOP for use with Microsoft 365 using OAuth](https://knowledge.mdaemon.com/how-to-setup-oauth-m365) - [How to use Windows permissions to restrict access to the MDaemon user directory](https://knowledge.mdaemon.com/restrict-access-to-the-mdaemon-user-directory) - [How to bypass Location Screening using Two Factor Authentication for Webmail logins](https://knowledge.mdaemon.com/bypass-location-screening-two-factor-authentication) - [How to update the license file to resolve licensing issues in MDaemon and/or SecurityGateway](https://knowledge.mdaemon.com/update-license-file) - [How to enable and use the instant messaging service in Webmail](https://knowledge.mdaemon.com/webmail-instant-messaging-setup) - [How to collect crash dumps to send to Technical Support](https://knowledge.mdaemon.com/how-to-collect-crash-dumps) - [How to setup MultiPOP for use with Google using OAuth](https://knowledge.mdaemon.com/how-to-setup-oauth-google) - [How to enable SFP Verification and create a simple SPF record](https://knowledge.mdaemon.com/spf-verification-record-creation) - [How to sync calendars and tasks to the macOS Calendar application using CalDAV](https://knowledge.mdaemon.com/macos-sync-calendars-caldav) - [How to create and publish an Autoconfiguration file for easy Thunderbird client configurations](https://knowledge.mdaemon.com/thunderbird-autoconfiguration) See less ▼ ## Mobile Device Management - [How do I set up an IMAP email account using the Apple iPhone?](https://knowledge.mdaemon.com/how-to-set-up-an-imap-email-account-using-the-apple-iphone) - [MDaemon Email Server](https://knowledge.mdaemon.com/mdaemon-email-server#main-content) - [Mobile Device Management](https://knowledge.mdaemon.com/mdaemon-email-server#mobile-device-management) - [MDaemon AntiVirus (SecurityPlus)](https://knowledge.mdaemon.com/mdaemon-antivirus-securityplus) - [ActiveSync for MDaemon](https://knowledge.mdaemon.com/activesync-for-mdaemon) - [MDaemon Connector for Outlook (Outlook Connector)](https://knowledge.mdaemon.com/mdaemon-connector-for-outlook-outlook-connector) - [SecurityGateway for Email Servers](https://knowledge.mdaemon.com/securitygateway-for-email-servers) - [RelayFax Network Software](https://knowledge.mdaemon.com/relayfax-network-software) [![Chill listening crop-3](https://knowledge.mdaemon.com/hs-fs/hubfs/belch.io/template-assets/MDaemon-Technologies_logo.png?width=199&height=41&name=MDaemon-Technologies_logo.png "Chill listening crop-3")](https://www.mdaemon.com) [Knowledge Base Home](https://knowledge.mdaemon.com) Copyright © 2025, MDaemon Technologies