Guides
Deliverability guides
Practical deep-dives on authentication, reputation and deliverability, from our team.
Reverse DNS (PTR): why it matters and how to fix it
A server without a valid PTR starts at a disadvantage. What it is, how to check it and make it forward-confirmed.
Blacklisted IP: how to request delisting
Landing on Spamhaus or SpamCop blocks delivery. Here's how to find out why and get removed.
Dedicated vs. shared IP: which to choose
Is the IP reputation yours or your neighbour's? Pros and cons for different volumes.
Handling bounces: hard, soft and reputation
Ignoring bounces wrecks your reputation. How to tell them apart and what to do for each.
Spam traps: what they are and how to avoid them
A single trap address can burn your reputation. How they appear and how to stay clear.
Email headers explained
From, Return-Path, Message-ID, Received: what headers reveal and how to read them.
BIMI: your brand logo in the inbox
With DMARC at reject you can show your logo next to emails. How BIMI works and what you need.
One-click List-Unsubscribe: what changed with Gmail and Yahoo
Since 2024 bulk senders must offer one-click unsubscribe. Here's how to implement it properly.
IP and domain warm-up: a step-by-step guide
A fresh IP or domain starts with no reputation. How to ramp up volume without landing in spam.
Move to DMARC p=reject without breaking things
A reject policy protects your domain from spoofing. How to get there safely, starting from the reports.
SPF, DKIM and DMARC explained simply
The three DNS records that decide whether your emails are authentic, explained without jargon.
10 ways to stay out of spam
The practices that genuinely move the needle on deliverability, in one checklist.