Email SPF DKIM records before sending newsletters from a domain
Checking Email Authentication Records Before Sending Newsletters
Recipient servers check whether your domain permits the sending source when newsletters are dispatched. A missing or wrong authentication entry can route all your messages directly to the spam folder, or block them completely. SPF and DKIM are two pieces of data that indicate to receiving services who is allowed to send on your behalf. Reviewing these details ahead of your first campaign helps protect your sender reputation from early damage.
With SPF, you essentially list which servers and IPs have permission to send email from the name in the “From” field. DKIM attaches a cryptographic signature to each outgoing message, so the receiving side can check whether the body was altered in transit. Both pieces of configuration live inside your domain’s DNS records, generally managed through your domain registrar or DNS host. An absent or mistaken configuration means a fully legitimate newsletter can still fail authentication checks at the receiving server.
It’s worth knowing upfront that SPF and DKIM alone are no longer the complete picture for anyone sending newsletters at meaningful volume. Google, Yahoo, and Microsoft have all rolled out formal bulk-sender requirements since 2024 that add a third piece, DMARC, as effectively mandatory for domains sending around 5,000 or more emails a day to their users — and as of recent enforcement updates, non-compliant bulk senders can face outright rejection rather than just being routed to spam. Even for senders below that volume threshold, setting up DMARC is now widely recommended as standard practice rather than an optional extra, since these requirements and thresholds have been tightening over time and could plausibly keep evolving. Given how quickly this area has been changing, checking the current requirements directly from Google’s and Yahoo’s own sender guidelines before your first send is worth doing rather than relying on older advice.
Locating and Reviewing Your Current DNS Records
Open your domain hosting or DNS management panel, usually provided by your domain registrar or web hosting company. Look for a section labeled something like “DNS settings,” “DNS management,” or “Zone editor.” Check whether SPF and DKIM records already exist for your domain. An SPF record typically starts with v=spf1 followed by allowed IPs or include statements, while a DKIM record generally appears as a long text string tied to a selector name, such as s1._domainkey. If you don’t see these records at all, your domain likely has no email authentication configured yet. Even where records do exist, it’s worth verifying they match the current values your newsletter service provides, since these can change if you switch providers or that provider updates its own sending infrastructure.
Most email marketing platforms give you exact SPF and DKIM values to copy into your DNS. Using outdated or incorrect values can cause authentication to fail, so comparing the values sitting in your DNS panel against what your sending service currently lists in its own setup guide is a reasonable habit, particularly if it’s been a while since you first set things up.
Comparing SPF, DKIM, and DMARC Settings Before Sending
After locating your DNS records, compare the SPF and DKIM values against what your newsletter platform requires. Check whether the SPF record starts with v=spf1 and includes the sending service’s IP or include statement. For DKIM, confirm the record uses the correct selector name and matches the public key your sending service provides. Alongside these, check for a DMARC record as well — typically a TXT record at _dmarc.yourdomain.com — and, if bulk-sending requirements apply to you, that its policy is set to at least p=none, which is the baseline monitoring level most current bulk-sender rules call for. DNS changes don’t take effect immediately, so using a DNS lookup tool, or your platform’s own built-in verification feature, to confirm the records are actually visible is worth doing before assuming a change has taken hold.
Many platforms offer a test send or an authentication check that reports whether your domain passes SPF, DKIM, and DMARC checks together. Running this test before your first broadcast can help prevent an entire batch of undelivered or spam-flagged emails.
| Record Type | What to Check in DNS | Next Action |
|---|---|---|
| SPF | Starts with v=spf1 and includes the sending service’s IP or include statement | If missing, add the exact value from your newsletter platform; if present but incomplete, update it without duplicating the v=spf1 tag |
| DKIM | Uses the correct selector name and matches the public key from your sending service | If missing, create a new TXT record with the selector and key provided; if the selector name differs, use the exact name your platform specifies |
| DMARC | A _dmarc TXT record exists with a policy of at least p=none, aligned with SPF or DKIM | If missing, add one starting at p=none for monitoring, and consult current Google/Yahoo bulk-sender guidance for whether a stricter policy is expected for your sending volume |
| All records | DNS changes have propagated, checked via a lookup tool or your service’s verification test | If propagation is incomplete, wait up to 48 hours and recheck; if complete but authentication still fails, contact your newsletter platform’s support |
Testing Authentication and Avoiding Common Setup Mistakes
Send a test email to an address you control and inspect the full message headers. Look for lines reading spf=pass, dkim=pass, and dmarc=pass. If any shows fail, softfail, or neutral, the receiving server didn’t fully authenticate your message. Common causes include a missing include statement for your sending service in the SPF record, a DKIM selector that doesn’t match what your platform generates, a missing or misaligned DMARC record, or a second SPF record that conflicts with the first — only one SPF record should exist per domain.
Another common mistake is forgetting to update SPF, DKIM, or DMARC alignment when switching newsletter platforms or adding a secondary sending service. Each time your email setup changes, revisiting your DNS records to confirm they match the new provider is worth the few minutes it takes. Keeping a saved copy of your current records before editing anything helps you restore them quickly if a test fails afterward. After every DNS change, waiting for propagation and running another authentication test before scheduling your next newsletter is the safer sequence.