Friday 25 August 2023

STRATO: Unable to email / SPF Record

The following DNS SPF record should be configured for domains sending email via the STRATO email platform:


This resolves an issue whereby STRATO customers are unable to email users.

Emails sent to are rejected with the following message:

550 5.0.0 host said 5.7.26 This mail is unauthenticated, which poses a security risk to the sender and Gmail users, and has been blocked. The sender must authenticate with at least one of SPF or DKIM. For this message DKIM checks did not pass and SPF check for [Domain] did not pass with IP [IP Address].

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