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- Added: Support for Microsoft Windows Server 2016.
- Fixed: Blue screen error (BSOD) caused by Device Control module after removable media is inserted.
- Fixed: Self-Defense does not protect a specific registry key, disclosing partial product functionality.
- Fixed: Anti-spam filtering ability of messages with empty sender field.
- Fixed: Kernel does not terminate UDP connections opened for any anti-spoofing mail processing rule using DMARC authentication protocol
- Fixed: Anti-spoof validation (SPF) queries to domains using compression for data fields are being evaluated incorrectly
- Fixed: On Microsoft Exchange Server 2003, Sender Policy Framework (SPF) check routine controls are visible in advanced configuration screen, despite not being available during transport phase for this Operating System
- Minor bug-fixes
- Added: All nodes of an ESET cluster consisting of ESET Mail Security 6 for Microsoft Exchange Server can now share greylisting records in order to minimize delivery delays across multiple servers.
- Added: Industry standard sender anti-spoofing and mail validation mechanisms were implemented, namely Domain-based Message Authentication, Reporting and Conformance (DMARC), DomainKeys Identified Mail (DKIM) and Sender Policy Framework (SPF).
- Added: Access right management in mail quarantine web-interface.
- Added: Automatic discovery and exclusion of passive database copies.
- Added: Temporary rejection policy for suspicious emails with delayed reputation checks to detect and validate the edge of fresh spam waves.
- Improved: Recipient validation option with Active Directory in both mail processing rules and local quarantine.
- Improved: Import and export functionality of domain-to-IP lists.
- Improved: Automatic bypass of mail processing rules for messages manually released from quarantine.
- Improved: Transport protection layer can now inspect and quarantine individual mail attachments in addition to secure deleting.
- Improved: New mail processing rule condition aimed to assist in more effective spoofed sender detection.
- Fixed: Various minor bugs removed.
- Fixed: In a particular combination of outdated module the server may crash after installation during first reboot with HIPS enabled.
- Fixed: The mail database scanning thread could crash with too many or too long addresses in the recipients-field.
- Fixed: Regular reports on quarantined mail items did not work for Shared mailboxes.
- Fixed: Editing existing domains or item removals were not reflected in Domain-to-IP lists.
- Fixed: Resolving domains to IP’s might not work with specific addresses.
- Fixed: Discovery function required for automatic exclusions could crash randomly due to unexpected query return format.
- Fixed: NLD – Untranslated strings for public folders in selection tree of On-demand database scan dialog.
- Fixed: After initial installation on a 32-bit Windows Server 2003 R2, the UI of the product cannot launch successfully without server restart
- Fixed: The product installer repair procedure of causes the analysis of application protocols to malfunction permanently.
- Fixed: Mail server protection log cannot be transferred to ESET Remote Administrator.
- Fixed: Disabled antispam protection is being reported to ESET Remote Administrator as major functionality issue (red warning) instead of warning-like appearance.
- Fixed: Without the most recent module updates, certain mail processing rules become dysfunctional because they will not allow choice of any operators from predefined list.
- Fixed: Greylisting feature occasionally ignores domain-to-IP whitelist if multiple entries with various domains are configured.
- Fixed: The UI section in mail quarantine does not handle certain HTML tags in a secure manner.
- Fixed: Under specific circumstances, the uninstallation or repair procedure can stall and requires manual user input to retry and finish the procedure.
- Fixed: Product installer launched in command-line mode ignores the switch to not install Web and email protection.
- Fixed: Very long eShell scripts (or endless loops) lead to growing memory allocation due to insufficient memory management.
- Fixed: Mail processing rules that can assess real file content of mail attachments could fail if not used at mail transport layer but are applied during on-demand database scan or in connection with mailbox database protection instead.
- Fixed: Various other minor fixes and improvements.
- Fixed: Application event log shows frequent error identified as "Writing to stream failed" as a result of an issue with internal memory addressing.
- Fixed: Non-critical memory leak after repeated anti-spam scanning.
- Fixed: Visibility of scanning progress on blocked removable media.
- Fixed: Quarantine web interface settings are no longer visible on servers running the Edge Transport role.
- Fixed: With corresponding rule applied, Excel documents are being filtered out as archives due to their internal structure.
- Fixed: Filtered domain white- and black-lists exceeding certain number of entries are not correctly processed by UI.
- Fixed: Various minor UI fixes (tooltips appearance, checkbox displacement, input field alignment, etc.).
- Fixed: ESET Log Collector (included in the EMSX 6 installer) does not support the new Mail Server Protection log.