Release Notes for Synology MailPlus


Synology MailPlus is a powerful webmail service with rich features. You can send/receive mails via any mail servers at your will, and enjoy the centralized management of all the incoming and outgoing mails. You can design a beautifully-formatted mail with built-in stickers and inline images. Synology MailPlus provides labels and smart search functions to help you efficiently find and manage your mails. Through the integration with Synology Note Station, you can save any mails to Synology Note Station without any hassle.

Version: 2.2.1-11373


Compatibility and Installation

  1. Updated to be compatible with DSM 7.0.

Version: 2.0.7-0914

  1. Fixed an issue where MailPlus might not show the "Attach file” button in the mail composer after upgrading to MailPlus 2.0.6.
  2. Fixed an issue where the time of invited events which were sent from Synology Calendar might not be displayed correctly.
  3. Fixed an issue where searching mails might fail when there are too many existing mailboxes.
  4. Minor bug fixes.

Version: 2.0.5-0910

  1. Supports encrypting the content of push notification for new mails before sending it to third-party push notification servers.
  2. Supports displaying recipient information in Sent mailbox.
  3. Fixed an issue where groups including shared contacts might accidentally disappear.
  4. Minor bug fixes.

Version: 2.0.4-0906

  1. Supports Thai user interface.
  2. Fixed an issue where contacts from external sources (e.g. Google Gmail) might be duplicated automatically and cannot be deleted.
  3. Minor bug fixes.

Version: 2.0.2-0899

  1. Supports listing email addresses of shared contacts automatically according to contact frequency when entering the email addresses of sender/recipient. 
  2. Minor bug fixes.

Version: 2.0.1-0897

  1. Fixed an issue where email content might fail to display after the Internet connection resumes.  
  2. Minor bug fixes. 

Version: 2.0.0-0892

  1. Enhanced search speed for a large number of mailboxes.
  2. Supports search history and search operators in the search box.
  3. Supports message preview for replied mails during the send cancellation period.
  4. Supports downloading or forwarding mails in EML format.
  5. Supports selecting fonts for Chinese characters.
  6. Supports adding/importing contacts without email addresses.
  7. Supports copying images from MailPlus and pasting them to other composers or documents in different browsers. 
  8. Improved system stability.
  9. Minor bug fixes.

Version: 1.4.3-0744

  1. Enhanced system stability. 

Version: 1.4.1-0742

  1. Fixed a security vulnerability regarding MailSploit. (Synology-SA-17:82)
  2. Enhanced the format compatibility for tables copied from Microsoft Word.
  3. Fixed an issue where event invitation details from the Outlook desktop client cannot display in MailPlus under certain situations.

Version: 1.4.0-0735

  1. Supports internationalized email address to send mails with or receive mails from email addresses in local languages (e.g. Chinese and Russian).
  2. Fixed an issue where mails might not be seen when moved from shared mailboxes to other mailboxes.
  3. Minor bug fixes.

Version: 1.3.4-0698

  1. Enhanced the stability of high-availability clusters.
  2. Fixed an issue where memory leak might happen.
  3. Minor bug fixes

Version: 1.3.3-0695

  1. Fixed an issue where mails in shared mailboxes might unexpectedly duplicate if the mail system is in high-availability cluster.
  2. Fixed an issue where the permission settings of shared mailboxes might not be synced between servers in high-availability cluster.

Version: 1.3.2-0689

  1. Fixed an issue where large attachments from shared links cannot be downloaded.
  2. Fixed an issue where the message typeset might not display properly after emails are sent.
  3. Fixed an issue where the mail composer might close unexpectedly when replying emails in Priority Mailbox.
  4. Fixed an issue where creating mailboxes might fail if the names of mailboxes have existed before.
  5. Fixed an issue where deleting emails from the mail list might fail.
  6. Minor bug fixes.

Version: 1.3.1-0681

  1. Enhanced stability of Priority Mailbox.
  2. Fixed an issue where mailboxes/labels might disappear after upgrade to MailPlus 1.3.0.
  3. Fixed an issue where a sent reply in a mail thread might appear unsent when the thread was reopened.
  4. Fixed an issue where MailPlus might not show the "Numbering” and “Bullets” buttons in the mail composer when running on DSM 6.1.2.

Version: 1.3.0-0676


What’s New

    1. Supports sharing mailboxes with internal users.
    2. Added the Calendar Task plug-in for creating tasks from email content.  
    3. Supports browser notification for new messages in selected mailboxes or with specific labels.
    4. Supports inserting images and hyperlinks in the user signature.
    5. Added the “Chat now” and “Mail history” buttons in the contact information panel (Synology Chat should run on the same Synology NAS).
    6. When you reply to messages, the system will auto-select the replying email address where the message was received (with the corresponding SMTP option enabled in the Settings).
    7. Supports disabling auto-highlighter for date and time texts in email body.


    1. Enhanced user interface performance.
    2. Improved speed of receiving, moving, and deleting emails.
    3. Enhanced package loading speed.

Fixed Issues

    1. Fixed an issue where disabled users might show up in shared contacts.
    2. Fixed an issue where incorrect message content might show up after a certain email thread was opened.
    3. Fixed an issue where attached .ics files might not show up.
    4. Fixed an issue where certain email content might not display properly.
    5. Minor bug fixes.

Version: 1.2.2-0520

  1. Fixed an issue where emails sent from Outlook clients might not be quoted and collapsed properly.
  2. Fixed an issue where drafts with numerous recipients specified might not be editable after they were re-opened.
  3. Fixed an issue where single-message mails could not be archived.
  4. Minor bug fixes.

Version: 1.2.0-0516


What’s New

  1. Supports creating events in Synology Calendar by clicking dates/times in mail (Synology Calendar should run on the same Synology NAS).
  2. Added Chat plug-in for instant conversation (Synology Chat should run on the same Synology NAS).
  3. Added priority mailbox to show emails from specific mailboxes or labels in one view.
  4. Enhanced overall performance.
  5. Supports converting large attachments to shared links to reduce mail size
  6. Allows administrator to edit contact group names in shared contacts.
  7. Allows administrator to enable/disable functions below for users:
    1. Creating events in Synology Calendar from dates/times
    2. Creating shared links for large attachments
  8. Added app launcher to open Synology collaboration packages: Chat, Calendar, and Office.
  9. Supports changing display language at Settings > General.
  10. Supports applying filter rules to POP3-fetched mails.
  11. Supports saving attachments to your Synology NAS.
  12. Supports regularly auto-deleting spam and trash mails before a specified time.
  13. Supports regularly auto-archiving mails in Inbox before a specified time.
  14. Supports highlighting matched text in keyword search.
  15. Supports marking selected text in “Quote” format in mail composition.

Fixed Issues

  1. Fixed an issue where auto-completing email addresses from Windows AD domain might not work.
  2. Fixed an issue where undoing a large number of moved or deleted mails might be slow.

Version: 1.1.2-0465


What’s New

  1. After both MailPlus and MailPlus Server are updated, all the annual licenses will automatically turn into perpetual licenses with non-expired validity, and will be regulated under the new licensing plan. For more information, please visit here.
  2. Supports shared contacts from Windows AD domain or LDAP server.
  3. Allows the administrator to disable the OpenPGP encryption function.
  4. Supports syncing contacts from the following external sources: Google Gmail, Microsoft, Yahoo Mail, and CardDAV servers.

Fixed Issues

  1. Fixed an issue where MailPlus might send redundant notifications to the mobile app.
  2. Fixed an issue where POP3 mail fetching could not work for mailboxes named with Chinese characters.
  3. Fixed an issue where long quotations in email replies might not appear in full form.

Version: 1.1.1-0439

  1. Added supported models: DS216+, DS216+II, DS713+, DS412+.
  2. Supports using contact information from Windows AD domain as shared contacts.
  3. Added the administrative option to disable OpenPGP.
  4. No push notifications will be sent for unread emails identified as Spam/Trash.
  5. Fixed an issue where certain SMTP servers could not be added to MailPlus.
  6. Minor bug fixes.

Version: 1.1.0-0413


What’s new

  1. Supports push notification for Android/iOS MailPlus mobile app (Synology Application Service 1.0.0 or above required).
  2. Supports OpenPGP for email encryption and decryption.
  3. Supports designating a specific mailbox as the archived mailbox.
  4. Supports reordering filter priority.
  5. Supports changing display density in two-column view mode.
  6. Supports viewing attached documents with Document Viewer.


  1. Optimized composer usability.
  2. Enhanced user interface performance.
  3. Enhanced system stability.

Fixed Issues

  1. Fixed an issue where the “@” sign could not be typed with an Italian keyboard.
  2. Minor bug fixes.

Version: 1.0-0369


What's new

  1. Since the license mechanism and account management for MailPlus has started, please make sure you have enough valid licenses installed in MailPlus Server for the activated user accounts. Otherwise, the functions of MailPlus/MailPlus Server will be limited. For more information on MailPlus license mechanism, please check here.
  2. MailPlus is a powerful webmail service that provides rich features. The beautifully designed user interface and functionality help you work intuitively on your everyday email with efficiency.
  3. Organize your email with the physical mailboxes or assign multiple attributes onto the email by applying labels for an intuitive and convenient email management.
  4. Send and receive mail to and from other mail servers with the customizable SMTP service and POP3 fetch function.
  5. Find and manage your email efficiently with the smart search function.
  6. Filters automatically moves your incoming or outgoing email to the appointed mailbox or applies labels.
  7. Customize wallpaper and theme settings.
  8. Enrich your email content with the built-in stickers.
  9. With Synology Web Clipper, you can easily save the conversation in MailPlus to Note Station for management.
  10. Supports attaching files from DSM.
  11. Supports undo operation for Delete/Move/Archive/Set read & unread/Apply & remove label actions.
  12. Customize auto-reply messages for different senders.
  13. Supports browsing history.
  14. You can now auto-empty Spam/Trash mailboxes on logout.
  15. Clip long email messages to shorten loading time.
  16. List email addresses according to contact frequency when specifying the sender/recipient.
  17. Group contacts will be displayed when specifying the sender/recipient in the mail composer.
  18. Task progress will be displayed after setting up the filters.
  19. Supports keyboard shortcuts to view and manage messages more efficiently.

Limitation & Known Issues

  1. Initial retrieval of mail using the POP3 fetch function may take longer than usual.
  2. MailPlus is required to be installed on both Synology NAS devices to ensure the stability during the role switch between the primary and secondary servers.
  3. Both Synology NAS devices must have the identical MailPlus application portal and privilege settings to ensure stability during the role switch between the primary and secondary servers.