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Axigen 9.x

How to Preserve the Message Headers Used by the DKIM Signing When Using Axigen as a Mail Gateway

Sep 7, 2015  •  2 min. read

When messages are DKIM signed using the "simple" Header Canonicalization Algorithm, the message headers must not be modified when the message transits intermediate mail servers in order for the DKIM verification to pass.

If the DKIM signed messages are relayed via a mail gateway it is preferable to use the "relaxed" Header Canonicalization Algorithm which is more tolerant to common in-transit modifications like white space replacement and line wrapping.

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Axigen is a premium, scalable, all-in-one Windows & Linux mail server software. A free mail server version is available for personal and lab use, along with the business mail server and the MSP mail server, for Managed Service Providers, which also include features like personal organizer, groupware, AntiVirus, AntiSpam, or advanced security policies. The carrier-class ISP mail server solution completes the Axigen offering and comes with clustering support, delegated administration, extensive APIs, as well as a cloud-native, Kubernetes based deployment option.

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