Deliverability
Deliverability guides and product notes — no filler.
Email blocklists (DNSBLs) explained
What an email blocklist (DNSBL) is, how mail servers query one, the five kinds of lists and what a hit means, and which lists actually matter.
What is BIMI, and how to get your logo in the inbox
BIMI displays your verified brand logo next to authenticated mail in Gmail, Apple Mail, and Yahoo. Learn the DMARC, logo, and VMC requirements.
MTA-STS and TLS-RPT: encrypting mail in transit
How MTA-STS and TLS-RPT enforce encrypted mail delivery: what each record does, the DNS and policy-file setup, and a safe testing-to-enforce rollout.
How to read DMARC reports before you enforce
DMARC aggregate (rua) reports arrive as dense XML. Learn what they contain, how to spot legitimate sources failing alignment, and when to enforce.
How to warm up a new email domain or IP
How to warm up a new email domain or IP: build reputation gradually so your first big send doesn't land in spam — the ramp and the pitfalls.
How an email sending subdomain protects your reputation
A dedicated email sending subdomain keeps a bad campaign from torching your transactional mail. Reputation isolation, SPF/DKIM/DMARC, and warm-up.
Google Postmaster Tools: read what Gmail really thinks
Google Postmaster Tools is Gmail's free sender dashboard. Verify your domain, read every metric, and act on spam rate and reputation.
Microsoft SNDS and JMRP: measuring your Outlook reputation
Microsoft SNDS and JMRP show your per-IP volume, complaint rate, spam-trap hits, and green/yellow/red filter result for Outlook.com mail.
Inbox placement testing: what seed tests really prove
A seed test previews where your campaign lands across Gmail, Outlook and Yahoo — inbox, spam, or missing. What it measures and its limits.
How to set up SPF, DKIM, and DMARC in Cloudflare
Set up SPF, DKIM, and DMARC in Cloudflare DNS: where to add each TXT record, what to enter in the Name field, and how to verify it works.
Set up SPF, DKIM, and DMARC in GoDaddy
Add SPF, DKIM, and DMARC records in GoDaddy DNS: find the editor, use the @ Name-field convention, then verify. Step-by-step 2026 guide.
How to set up SPF, DKIM, and DMARC in Namecheap
Set up SPF, DKIM, and DMARC in Namecheap: where each TXT record goes in Advanced DNS and what to type in the Host field for @, _dmarc, and DKIM.