Admin Hub
Email is the most important and most attacked communication channel in most companies, and without clean identities neither mail routing nor permission management works. This hub collects hands-on knowledge from more than 14 years of running large mail environments: SMTP and mail flow, encryption gateways such as SEPPmail and Totemomail, the HIN mail gateway in the Swiss healthcare sector, Exchange and Microsoft 365 in hybrid scenarios, plus Active Directory, LDAP, and Microsoft Entra ID as the foundation behind it all. It also includes free tools to check your own domain and mail configuration right in the browser.
Mail DNS Check
Check a domain's MX, SPF, DKIM, DMARC, and more in seconds.
Mail Header Analyzer
Trace an email's delivery path and authentication from its header, 100% locally in your browser.
Analyze a header →Command Builder
Assemble DNS, SMTP, TLS, LDAP and network commands for PowerShell or the shell, built-ins first.
Build a command →HIN Check
Is an email address reachable securely via HIN? Checks the mail domain against HIN's directory.
LEG Price Calculator
Is a Swiss local electricity community worth it? Grid discount versus service fee, for consumers and solar producers.
Run the numbers →Topics in this hub
Latest articles
NewExchange Outages After the October 2026 Windows Server Updates: MapiExceptionMdbOffline (ec=1142)
After the Windows Server updates of October 13, 2026, Exchange servers report MapiExceptionMdbOffline (ec=1142) after around 24 hours: OWA fails, queues grow, and DAG copies stop replicating. Microsoft confirms the link to the Windows updates, but a fix is not yet available. Symptoms, affected KBs, verification commands, and recommended steps.
NewCVE-2026-76519: Cisco Secure Email Gateway Path Traversal Is Being Exploited - Update and Check for Compromise
A crafted email attachment is all it takes: Through a path traversal vulnerability in the AMP File Reputation feature, attackers can write arbitrary files to Cisco Secure Email Gateway and execute commands with root privileges (CVE-2026-76519, CVSS 9.8). The vulnerability is being exploited. Updating the Content Scanner Tools or AsyncOS and checking for compromise are required.
NewOctober 2026 Exchange security updates: six vulnerabilities, final update for Exchange 2016 and 2019
The October SU closes six vulnerabilities, including a critical remote code execution issue through a crafted email, and fixes the .ics issue and the WordBreaker deadlock. It is the final update for Exchange 2016 and 2019, including under the ESU program.
NewCVE-2026-96951: Windows Shell Mark of the Web Bypass Is Being Exploited—Install the October Update
On October 13, 2026, Microsoft fixed an already exploited Windows Shell vulnerability (CVE-2026-96951, CVSS 8.8). Crafted files delivered by email or chat can bypass Mark of the Web protection. CISA lists the vulnerability in its KEV catalog; only the cumulative October update resolves it.
Exchange Security Update September 2026 v2: Early Fix for CVE-2026-96940
On October 2, 2026, Microsoft released version 2 of the September SUs for Exchange SE, 2019, and 2016. It also addresses CVE-2026-96940, an elevation-of-privilege vulnerability with a CVSS score of 8.8 and an “Exploitation More Likely” assessment. Microsoft recommends installing v2 as soon as possible, including on servers running the first September SU.
September 2026 Exchange Security Updates: Nine Vulnerabilities, Wrapper Issue Fixed, v2 Released
The September SU closes nine vulnerabilities in Exchange SE and 2019 (eight in Exchange 2016), including a spoofing vulnerability with CVSS 9.3, and fixes the wrapper issue in hybrid environments. A v2 with an additional CVE followed on October 2; there are also three known issues with workarounds and a SettingOverride that should now be removed.
