Deliverability
Deliverability guides and product notes — no filler.
Email feedback loops (FBLs) explained
Email feedback loops forward spam complaints back so you can suppress complainers. How they work, which providers offer them, and why Gmail is different.
Dedicated vs shared IP for email sending
Dedicated vs shared IP for email: how each affects reputation and warmup, the volume that justifies a dedicated IP, and which one you should choose.
Email blocklists (DNSBLs) explained
Email blocklists (DNSBLs) can send your mail to spam for millions of recipients at once. How they work, how you get listed, and how to check and delist.
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.
Email list re-engagement: win back the dormant, protect the inbox
Re-engage dormant subscribers before they hurt deliverability: run a win-back campaign, set a sunset policy, and verify the list first.
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.