You write an important email, hit send, and it quietly lands in the recipient’s spam folder, or never arrives at all. It is one of the most frustrating problems in business, and the cause is usually not your message but your settings. Three small pieces of setup, known as SPF, DKIM and DMARC, tell the world’s inboxes that your email is genuine. This guide explains what they are, without the jargon.
Why good email ends up in spam
Email was built in a more trusting age, when anyone could send a message claiming to be from anyone. Spammers and scammers have exploited that ever since, forging addresses to impersonate real businesses. In response, inbox providers became strict. They now check whether an email is really authorised by the domain it claims to come from, and if they cannot tell, they treat it with suspicion.
That is the heart of the problem. If your domain has not been set up to prove your email is legitimate, your perfectly honest message can look just as doubtful as a fake one. The fix is to add that proof, which is exactly what these three records do.
SPF: who is allowed to send
SPF, the Sender Policy Framework, is a list of the servers allowed to send email for your domain. When a message arrives, the receiving server checks whether it came from one of those approved sources. If it did, that counts in its favour; if it came from somewhere not on the list, that is a warning sign. Think of SPF as a guest list for your email.
DKIM: a tamper-proof seal
DKIM, DomainKeys Identified Mail, adds a hidden digital signature to every message you send. The receiving server can check that signature to confirm two things: that the email really did come from your domain, and that it was not altered on the way. It is like a wax seal on a letter, proving who sent it and that nobody has opened it in transit.
DMARC: your instructions, and your report
DMARC, which stands for Domain-based Message Authentication, Reporting and Conformance, ties the first two together. It lets you tell inbox providers what to do with any email that fails the SPF and DKIM checks, from simply watching it to sending it to spam or refusing it outright. It can also send you reports, so you can see who is sending email in your name, including anyone trying to impersonate you.
How they work together
The three are a team, and they are strongest together:
- SPF says which servers may send for you.
- DKIM proves each message is genuine and untampered.
- DMARC sets the policy and reports back on what is happening.
With all three in place, inbox providers can see at a glance that your email is trustworthy, so far more of it reaches the inbox rather than the spam folder. As a bonus, they make it much harder for anyone to send scam emails pretending to be your business, which protects your reputation as well as your delivery.
The good news: you often do not have to
These records are added to your domain’s DNS settings, and getting the details exactly right matters, because a small error can do more harm than good. The reassuring part is that with the right hosting, much of this is set up for you.
With Lucid Cloud Platform, email on your own domain comes with the sending records configured correctly from the start, and a support team ready to help if you need SPF, DKIM or DMARC explained or adjusted. Getting your email into the inbox should not require a computer science degree, and with the right setup behind you, it does not.
