Learn what a DMARC reject policy does, when to enforce p=reject, and how to protect deliverability before and after you flip the switch. Practical guide.
Learn how an SPF record works, how to create and check one, and why SPF authenticates senders but doesn't guarantee inbox placement. Syntax and fixes included.
Run an SPF test to check your SPF record for syntax errors, multiple records, and lookup-limit issues. Learn how to read the results and fix common failures
An "SPF failed for IP" message, whether it shows up in a bounce notification, a DMARC aggregate report, or a mail server log, points to a specific and usually fixable problem: a sending IP address wasn't found among the sources authorized in the domain's SPF record.
DKIM is often described as one of the more reliable authentication protocols, and in a technical sense it is: the cryptographic verification either matches or it doesn't.
A message can pass SPF. It can pass DKIM. And it can still fail DMARC. This surprises a lot of people setting up DNS authentication for the first time, because it seems to contradict how the three protocols are usually described together.
SPF records look simple enough to write from memory, and that's exactly what causes most of the problems with them.
A DMARC record looks deceptively simple: a single line of text published in DNS. But that line is made up of several distinct DMARC tags, each controlling a different piece of behavior, from how strictly failures are enforced to where reporting data gets sent to whether alignment needs to be strict or relaxed.
Publish a DMARC record with reporting enabled, and within a day or two, an inbox starts filling up with compressed XML attachments from Google, Microsoft, Yahoo, and dozens of smaller providers.
Showing 1 to 9 of 15 results
Deliverability insights, product updates, and early access to new features. No spam, unsubscribe anytime.
By subscribing, you agree to our Privacy Policy. Unsubscribe anytime.