I have a customer with Zimbra mail server (on premise installation).
Does Sophos Email support this server?
They want to review outbound email traffic.
Zimbra is available in two product Editions: Zimbra Open Source Edition and Zimbra Network Edition. Zimbra Network Edition is available for on-premises deployment in Professional and Standard Editions.
Thank you for contacting the Sophos Community.
No natively like Gsuite or O365, but you can select the Custom Gateway option.
If you need assistance with the configuration or want to know if specific features that Zimbra uses will work with Central Email, please reach out to your Sales Engineer for a PoC.