SPF (Sender Policy Framework)

The Sender Policy Framework (SPF) procedure makes it difficult to forge email sender addresses. The receiving mail server checks whether the sending mail server is authorised to send emails (for example, newsletters) with a specific sender domain. If the receiving mail server determines that the sending mail server is not allowed to send emails for a specific sender domain, the email can be classified as spam and placed in the recipient's spam folder. The delivery of emails is therefore not prevented due to a failed send authorisation. However, the sender’s reputation will be damaged and the newsletter is unlikely to be read.

When Inxmail Commerce is used, the physical mailing dispatch takes place via the Inxmail mail server. Therefore, you must store Domain Name System (DNS) entries with your Internet Service Provider (ISP) in order to specify that Inxmail is an authorised sender for your sender domain.

The Brand Identity Protectionfeature makes it easier for you to set up your domains correctly in order to ensure a successful SPF check, see: Initial set-up: Implementation scenarios.

Note: The SPF procedure only checks the domain of the sender address. To check the sender and email content, you must also use DKIM (DomainKeys Identified Mail) and DMARC (Domain-based Message Authentication, Reporting and Conformance).