Synology MailPlus

Synology MailPlus Server

Features

  • Privately-owned mail service on a Synology NAS, providing multiple domain centralization management, user policy, and mail logs for easy management
  • Cross-platform mail solution for accessing emails on a computer and a mobile device
  • Full-fledged security features for the defense against malicious attacks: Rspamd anti-spam mechanism, spam auto-learning, ClamAV anti-malware, and advanced SMTP security
  • High-availability cluster for an uptime mail service during system updates and hardware replacements via switching the mail system to the paired server in seconds
  • Seamless mail migration tool designed for Gmail, G Suite, Microsoft Exchange, Yahoo, and other IMAP servers

Specifications

  • Monitoring
    • Outgoing emails sent, resent or unable to be sent from your Synology MailPlus Server, and incoming emails received or rejected by your Synology MailPlus Server
    • Real-time server information including high-availability cluster status
    • Statistics of various kinds of email threats presented by graphs
    • Statistics of blocked inbound and outbound emails respectively, along with top senders/recipients of such emails
  • Management
    • Multiple domain management and configuration settings related to alias, auto BCC, usage limit, and disclaimer in Synology MailPlus Server
    • SMTP authentication that forces clients to provide user credentials for login when connecting to Synology MailPlus Server via SMTP
    • SMTP settings and diverse policies for blocking emails which exceed the limit: hostname, SMTP banner, the maximum number of recipients per email, the maximum number of email hops, and the maximum size per email for Synology MailPlus Server
    • External postmaster that is set to receive system emails sent to Mailer-daemon and Postmaster aliases from other mail servers
    • Mail delivery settings that allow sending emails through other mail servers so that mail contents will not be exposed to the Internet and subject to possible attacks
    • Synology MailPlus as a relay server that sends emails for servers listed on the trusted list, and receives emails listed on the domain list
    • Blacklist and whitelist that can be set to reject, discard, or allow certain emails based on various criteria
    • Connection policies that block emails sent from senders from unidentifiable domains and hosts that cannot be identified or may cause Synology MailPlus Server to be overloaded
    • Communication between Synology MailPlus Server and external mail servers/third-party clients via SMTP, POP3, and IMAP protocols
    • High-availability cluster that maximizes mail service uptime during system updates and hardware replacements via switching the mail system to the paired server in seconds
  • Security
    • Custom spam filtering rules for scanning and blocking allow auto-learning from reported spam to achieve accurate detection
    • DNSBL (DNS-based Blackhole List) filters out spam published through the Internet Domain Name Service (DNS) based on a list of IP addresses of computers or networks
    • Greylist function returns a temporary error to mail clients
    • Antivirus engines ClamAV and McAfee (paid option) scan all the incoming and outgoing emails for viruses. When an email is found infected, the system will delete/quarantine the email and send notifications to the related recipients
    • ClamAV antivirus engine databases such as Google SafeBrowsing database or a third-party database help detect malicious links in emails
    • Virus definitions will be automatically updated by the custom schedule
    • Authentication mechanisms, such as SPF verification, DKIM verification, and DMARC, validate inbound emails and reduce spam
    • Emails with potentially dangerous elements will be filtered after scanned by content and attachment file types
    • MCP (Message Content Protection) rules can be applied to filter or block the targeted emails. If an email is matched with the rule's criteria, the rule score will be the total sum of the MCP score. If the total MCP score exceeds the MCP threshold score you defined, the mail system will execute the action you have selected from the following: Save to quarantine, Deliver anyway, Delete mail, Notify sender, or Forward
  • Auditing
    • Displays logs of the mail queue for users to view the status of emails and to manipulate emails in the queue
    • Displays logs regarding incoming/outgoing emails through your Synology NAS
    • Displays administration logs to record setting changes made by administrators
    • Allows keyword search for deleting or exporting emails
    • Forwards logs to another server to back them up or transfers logs to a syslog server for centralized management
    • Tracks the mail system/traffic and sends logs periodically
  • Mail Migration
    • Seamless migration tools for migrating from Gmail, G Suite, Microsoft Exchange, Yahoo, and other IMAP servers (Supports reusing system configurations from Microsoft Exchange for quick system replacement)
    • Multiple tasks for mail migration from external mail servers: custom filters for bypassing spam emails, emails received after user-defined date, and emails exceeding the maximum size limit (KB)
    • Mail migration without access permissions of each source account for Microsoft Exchange users with the delegated account
  • Sizing
    • Recommended number of users: up to 1,800* 
    • Recommended number of emails processed per day: up to 4,773,000*
Note
  • The number of users and emails processed per day may differ among Synology NAS models. Refer to the product specification for each NAS model's recommended number
  • You can also refer to the Synology MailPlus License page for details

Limitations

  • Only models with 512MB RAM or more can automatically update virus definitions

Synology MailPlus

Features

  • An intuitive and powerful webmail client designed for organizing emails, and sharing mailboxes with work partners
  • User interface like three-column mode and the option for conversation view to better fit user's familiar experience
  • Custom filters and priority mailbox for effective mail management
  • MailBox sharing with other users for email centralization of a specific project
  • A hub of communication and schedules with its seamless integration with Synology Chat and Synology Calendar

Specifications

  • Compose
    • Auto-complete list based on recipient email addresses saved in Contacts
    • Auto-saved drafts
    • OpenPGP for encrypting/signing emails
    • Send cancellation period of 5, 10, 15, 20, or 30 seconds
    • User-defined text styles: font styles, font sizes, and colors
    • Auto-reply/forward based on user settings
  • Mail Management
    • Centralizes management with a priority mailbox collecting emails from various mailboxes or labels
    • Filters emails with custom exception rules for email organization
    • Allows sorting emails by starring, archiving, moving to customized mailboxes, as well as adding labels
    • Allows sharing the mailbox with internal users/groups to centralize emails over a specific project. Specific access permission to the shared mailbox can be assigned to each user/group
    • Allows archiving mailbox to make all the archived emails appear in this mailbox
    • Provides two columns and three columns for the split pane mode. There are further format options for two columns: one line without preview, one line with preview and two lines
    • Provides a universal search bar with syntax operators to help find specific emails quickly and easily
    • Gives flexible options for the display of external images: to always display external image from and to ask before displaying. The latter option prevents malicious senders from exploiting externally linked images
    • Sends push notifications with a browser extension (optional)
    • Displays emails in conversation mode or individual message mode. In conversation mode, a single email will be grouped with all its replies
  • General Settings
    • Signature setup for outgoing emails with various format tools (e.g., font size, color, and image insertion)
    • Restores a conversation mistakenly identified as spam
    • Allows adding additional SMTP servers or editing existing ones according to one's preference for email. For example, you can add the Google SMTP server and enter your Google account and password to send emails via Google account in Synology MailPlus
    • Customizable POP3 servers and predefined ones (e.g., Gmail) for fetching emails from different servers to Synology MailPlus
  • Administrator
    • Allows users to receive emails from external POP3 mail servers
    • Allows users to share links for large attachments
    • Allows users to set OpenPGP to encrypt/sign emails
    • Allows users to customize the logo in Synology MailPlus web portal
  • Integration
    • Integrates with Synology Chat and Synology Calendar, serving as a hub of communication and schedules. With the plug-ins of Synology Chat and Synology Calendar, users can dive into project discussions and add emails to your to-do list right from Synology MailPlus
    • Adds conversation to Synology Calendar tasks

Limitations

  • The "Administrator Settings" tab is visible only when users sign in with an admin account

Synology MailPlus Mobile

Features

  • Intuitive user interface for composing mails, receiving mails, and managing mails across Android or iOS devices
  • Labels and user-defined mailboxes for custom mail organization
  • Multiple templates, various built-in stickers and emoji for a quick reply
  • Contacts sharing in the account system for a quick selection of senders/recipients
  • Mobile signatures created in mobile Synology MailPlus

Specifications

  • Email management
    • Conversation view for intuitive mail browsing
    • Easy ways to keep mailboxes organized: apply labels, move to a certain mailbox, and mark as starred/read/unread
    • Localized email address to send emails with or receive emails from email addresses in native languages (e.g., Chinese and Russian)
    • Swipe gestures for moving across the next or previous email thread
    • Actions on email notifications: delete, archive, and mark as read
    • Undo operations for the labeled actions: delete, move, archive, and remove
    • Mail printing in a thread
    • Image viewer for viewing attached images without downloading
    • Manual events adding to Synology Calendar
  • Security
    • Passcode lock for data protection (Touch ID supported)
    • OpenPGP for email encryption and decryption
    • Reports of suspicious emails sent to the system administrator for spam learning enhancement
  • Settings
    • Custom swipe options: delete, archive, mark as Spam/Not Spam, mark as read/unread, apply labels, move to a certain mailbox
    • Custom preview lines based on user preferences
    • Font size settings: large, medium, small
    • Push notifications when there is an email received in the user-defined mailboxes
    • Mobile signature settings for sender information display
    • Multiple templates for a quick reply
    • Auto remote images loading
    • Email content prefetching on Wi-Fi only
    • Integration with Synology Calendar or other calendar applications
    • Mailbox management: create, edit, and delete mailbox
    • Label management: create, edit, and delete labels
    • Cache storage limit for images and attachments