Few things damage trust faster than a client's important email quietly landing in spam. The good news: deliverability isn't luck. It comes down to a handful of DNS records and some sensible habits — and once they're right, they stay right.
Why this is your problem, not the client's
If you set up a client's hosting and email, then their invoices stop arriving, guess who gets the call? Deliverability lives in the same place you already work — DNS and hosting — so it's squarely in your wheelhouse to get right, and a great way to look like a pro.
The three records that do the heavy lifting
SPF — who's allowed to send
SPF is a DNS record listing which servers may send mail for the domain. If a message comes from somewhere not on the list, receivers treat it as suspicious. Get this wrong (or list too many things) and legitimate mail gets penalised.
DKIM — a tamper-proof signature
DKIM cryptographically signs each message so the receiver can confirm it really came from you and wasn't altered in transit. It's the difference between "claims to be from you" and "provably from you."
DMARC — the policy that ties it together
DMARC tells receivers what to do when SPF or DKIM fails — and, crucially, can email you reports on who's sending as your domain. Start in monitoring mode, read the reports, then tighten to quarantine or reject once you're confident.
Habits that keep you in the inbox
- Use a real, authenticated sending service for anything automated — never send bulk mail straight from a cheap shared host.
- Keep lists clean. Bounces and spam complaints train providers to distrust you. Remove dead addresses.
- Warm up new domains. A brand-new domain sending thousands of emails on day one looks exactly like a spammer.
- Match the from-name to reality. Spoofy, mismatched senders trip filters and erode trust.
- Avoid spammy patterns — all-caps subject lines, link shorteners, single giant image with no text.
Set it, then watch it
Records drift. A new tool gets added, someone edits DNS, a certificate lapses — and suddenly deliverability quietly drops. This is exactly why monitoring matters: keep an eye on SPF/DKIM/DMARC and domain health so you hear about a problem from a dashboard, not from an angry client. Configure it once, monitor it always, and email stops being a mystery.
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