Uploaded February 2025 | Updated September 2026, 2 weeks ago

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Ensure uninterrupted email service with a MailPlus high-availability cluster using two Synology NAS. If one server faces an unexpected issue or needs hardware replacement, the other will seamlessly take over, keeping emails flowing smoothly.

00:46 Before you start
00:58 Protection Coverage
01:20 Preparation Before Configuring MailPlus High-Availability
07:05 Create a High-Availability Cluster
08:53 Simulate MailPlus Primary Server Failure

Learn more:
Synology MailPlus Server Administrator's Guide on High Availability:
kb.synology.com/UG/Synology_MailPlus_Server_admin_guide_3/12#x_anchor_idb5cdc05dc8
Synology MailPlus High-Availability cluster supported models list:
synology.com/dsm/packages/MailClient
Synology MailPlus High Availability White Paper:
kb.synology.com/WP/Synology_MailPlus_HA_White_Paper
How to set up your Synology MailPlus Server:
youtube.com/watch?v=tBLjJWn-WBk
How to join a Windows Active Directory:
synology.com/knowledgebase/DSM/tutorial/Management/How_to_join_my_Synology_NAS_into_Windows_Active_Directory_domain
Set Up LDAP Server:
kb.synology.com/DSM/help/DirectoryServer/ldap_server?version=7
How to join an LDAP server:
kb.synology.com/DSM/help/DSM/AdminCenter/file_directory_service_join?version=7
How do I configure DNS records for a mail server:
kb.synology.com/DSM/tutorial/How_to_configure_DNS_for_MailPlus
How to migrate emails from Local Users to LDAP Users or Domain Users:
kb.synology.com/DSM/help/MailPlus-Server/mailplus_server_service?version=7


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