Problem:Mail delivery from SEPPmail to the Exchange Server is no longer working.
SEPPmail-Mailversand an Exchange Server – Aktualisierung des Root-Zertifikats || SEPPmail Mail Delivery to Exchange Server – Root Certificate Update
Stop and think Before You Delete SEPPmail Certificates, Users or Alter Your Mailflow
Modifying a SEPPmail environment requires careful planning. Deleting certificates or users, or prematurely removing the appliance from your mailflow, can result in permanent data loss. If you manage a SEPPmail architecture, here is what you need to consider before making structural changes.
Reminder for recent SEPPmail appliance security updates
Please update your SEPPmail VM- or HW-Appliance to the latest OS version immediately (15.0.4.x branch). These critical updates are required to mitigate known vulnerabilities. Source: https://seppmail.statuspal.eu/info_notices/235299
SEPPmail: Wichtige Information zu Ihren E-Mail S/MIME Silver Zertifikaten von SwissSign || Important information regarding your E-Mail S/MIME Silver certificates from SwissSign
Solution update 06.05.2026 This is a addition to the solution update published on 23.04.2024 and was just communicated by the SEPPmail support today: If certificates should be re-issued after they where revoked by Swisssign a manual check of the revocation status has to be done. See: https://docs.seppmail.com/en/07_mi_15_usr_04_advanced-settings.html#as_revocationClicking on the Check…
SEPPmail and the winmail-headache
When using the SEPPmail Secure E-Mail Gateway for transparent email encryption, administrators occasionally encounter a frustrating phenomenon: recipients receiving unreadable emails, attachments named winmail.dat, or broken calendar entries.
M365 Exchange Online: The Shift to Certificate-Based Connectors
Microsoft has allowed the use of IP-based connectors in Exchange Online to authenticate mail flow. However, as more organizations move toward shared infrastructure, multiple MTA (Mail Transfer Agent) systems, or shared public IP addresses, IP-based authentication has proven to be increasingly unreliable.
SEPPmail OnPrem: Internal Server Error bei GINA Accounts mit Status “enabled”
Letztes Update: 31. Juli 2026 Im SEPPmail Admin GUI scheint es einen kleinen “Glitch” zu geben welcher dazu führen kann, dass für gewisse Administratoren der Zugriff auf bestehende GINA-Benutzer nicht mehr möglich ist. Der Workaround bzw. die Lösung dazu ist jedoch erstaunlich einfach.
SEPPmail On-Premises: Act Now!
SEPPmail has published a software update to fix multiple vulnerabilities. Affected versions: All versions before 15.0.3
Action Required: New DigiCert Global Root G2 Certificate
DigiCert has released a new CA certificate. Systems that do not automatically update and trust new CA certificates may require manual intervention to prevent service disruption. Email communication may be interrupted if the certificate is not trusted before it is used to sign certificates. As SEPPMail appliances do not update…
SEPPMail is Upgrading their Licensing and Update System
This summer, SEPPMail is making a significant upgrade to their internal system for licensing and updating SEPPMail appliances. The old system, the License and Update Server, has served us well, but it was time for an overhaul to meet the growing demands for scalability and extensibility. SEPPMail is excited to…