Hard Bounces vs Soft: What Each One Costs You
Hard and soft bounces explained in plain English, and why your sender reputation pays for every one of them.
Tools
Free email diagnostic tools, no signup
Every tool runs entirely in your browser — nothing is sent, nothing is stored.
Email authentication checker
Check any domain's SPF, DKIM and DMARC records — live DNS lookups, interpreted in plain English, with enforcement levels and the SPF lookup count explained.
DMARC report viewer
Upload the aggregate report your inbox provider sends you — get a plain-English read on who's sending as your domain, what's passing, and what's failing.
Preflight checklist
Ten checks to run before every campaign send — sanity check in minutes, before your campaign launches with mistakes.
Email ROI calculator
Enter your numbers and see what your email programme is worth today — and what improving open and click rates would add.
Mautic vs ESP cost comparison
Managed Mautic against typical ESP pricing — find out if and when self hosted email software becomes the best option for you.
SPF record generator
Build your SPF record sender by sender, with the ten-lookup budget visible as you add each include.
Prefer to have it done for you?
These tools help with basic diagnostics. When the diagnosis needs interpretation, judgment or remediation — I'm here to help.
From the blog
View all posts »Straightforward guides and updates on authentication, deliverability and overall strategy.
The DMARC Report Reading Checklist: What to Look At First
Aggregate reports arrive as unreadable XML. This is a guide to parsing and understanding those files. The fields that matter and the ones to ignore, plus, what each finding means strategically.
IP Warm-Up: Start Sending Without Torching Your Reputation
New sending infrastructure has no reputation, which receiving servers treat with suspicion. This guide is the staged process for building reputation safely, and the mistakes that can burn it in week one.
Dead Addresses: Worse Than No List at All
Bigger list, more sends. That used to be the whole logic of email marketing. It no longer works like that. How to prune a list, when to do it, and why keeping dead addresses hurts you.