Before you increase sending volume, run through this DNS and reputation checklist. Most inbox issues trace back to one of these six areas.
1. SPF (Sender Policy Framework)
Confirm a single v=spf1 TXT record on the apex domain includes every tool that sends mail. Watch for more than 10 DNS lookups and avoid +all.
2. DKIM (DomainKeys Identified Mail)
DKIM signs messages cryptographically. Look for a TXT record at selector._domainkey.yourdomain.com. Common selectors include google, default, and provider-specific names.
3. DMARC
Publish v=DMARC1 at _dmarc.yourdomain.com. Start with p=none plus rua reporting, then move toward quarantine or reject.
4. MX records
Valid MX records prove the domain is configured for mail routing. Wrong or missing MX can signal misconfiguration to filters and break replies.
5. Nameservers (NS)
Unexpected NS changes or lame delegations can indicate DNS hijacking or sloppy migrations—worth a glance during client onboarding.
6. Blocklists (DNSBL / URIBL)
If your mail server IP or domain appears on major blocklists, inbox placement suffers regardless of authentication. Check Spamhaus, SpamCop, SURBL, and related lists.
Automate the checklist
Doing this manually across dozens of domains does not scale. FeedPipeline runs all six checks in one pass using Google Public DNS—free, no account required.
Export results as JSON, CSV, or TXT to share with clients or attach to onboarding docs.
Final thought
Authentication and reputation are cumulative. Fix DNS fundamentals first, then focus on content, lists, and engagement—the stack works best when the foundation is solid.