Sender Policy Framework (SPF) is an open standard that senders can use to publish which IPs are authorized to send email from their domain.  SpamHero is compatible with SPF and will usually pose no problems for such senders.

However, if your mail server has an SPF filter enabled, we recommend that you shut it off, because your mail server will see email coming from SpamHero's IPs and bounce messages that come from senders that have SPF enabled on their domain.

Tip: A common mistake we have seen our customers make is to delete their domain's own SPF record in an effort to shut off the SPF filter for their mail server.  There is no reason to delete your domain's SPF record as that will have no affect on your incoming email.  Your domain's SPF record affects your outbound email only.

If for some reason it is not possible to turn off your mail server's SPF filter, another option would be to configure your SPF filter to white list SpamHero's IPs so that it does not block email from SPF senders just because the sender's email passes through our servers.  Please refer to the Current List of SpamHero IPs document to obtain these IPs.

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