Compatibility

Compatibility list of providers for Mail Security

Last adaption: 02.2026

New:

Strato ist leider nicht kompatibel

notemptyThis article refers to a Beta version

Introduction

A list of the compatibility of various providers with Mail Security.
Whether incoming and outgoing routes can be configured, whether S/MIME is possible, and their special features and limitations.
notemptyThe information is based on Securepoint's current experience.
If a provider not listed here is used or if there are experiences contrary to this information, it would be desirable to discuss this via a support ticket.

Compatibility list

Mail Provider	Ingoing routes	Outgoing routes	S/MIME	Restriction / Special feature
Office365 / Entra				Further information can be found in the wiki article Securepoint Mail Security with Office365.
Own mail server				A fixed external IP (IPv4 or IPv6) is required
Strato				Outgoing traffic and S/MIME cannot be set up directly via Strato At Strato, the DMARC rule cannot be influenced or disabled. This means that some emails from Strato are rejected due to the DMARC rule
IONOS				For the destination server of the incoming route, mx00.customerserver.de or mx01.customerserver.de must be used Outgoing traffic and S/MIME cannot be set up directly via IONOS The only option is an outgoing route via SMTP Auth and the use of Mail Security in the email client as the outgoing mail server
ALL INKL				Since ALL INKL only accepts incoming emails if there is an MX entry for your own domain on All INKL, this does not provide comprehensive protection.
Gmail / Google Workspace				Screenshot anzeigen Eingangs-Gateway konfigurieren