Bounce Types Explained: Hard vs Soft, and What They Actually Cost You
A bounced email looks like one lost send. It isn't. Hard vs soft bounces explained in plain English — and why your sender reputation pays for every one of them.
About
I started in email marketing in 2006, when in comparison to more recent times, delivery was still the wild west. Over the following years I built a managed hosting and consulting business, adapting to rapidly changing technological and legal landscapes. The pace of that change has never been faster, with AI reshaping how email campaigns are sent and received.
I've worked with clients in the UK, Europe, the US and beyond, specialising in delivery systems, email authentication, marketing automation and strategy. MacDougall Email is the continuation of that work: same discipline, same specialities, modern tools.
Twenty years in, the fundamentals are unchanged: authenticated mail reaches the inbox, unauthenticated mail doesn't. Well-managed campaigns convert; poorly managed ones don't. The difference now is that the enforcement mechanisms are unforgiving, and it's hard for businesses to keep up to date with the latest best practices — that's where I come in: keeping your systems current while you run your business.
You work with the person doing the work. No account managers, no outsourcing
Recommendations backed by tests, reports and measurements — never "trust me".
What will be done, what it costs, and when it will be finished — agreed before anything changes.
Based in Scotland, working with clients wherever they are.

A defined process, agreed before anything changes — the same discipline for a one-off audit or for ongoing services.
Survey — consultation & investigation
We start with a conversation, then a technical survey of your current setup: DNS, authentication records, sending platforms, list hygiene. No proposals before diagnosis.
Explain — findings in plain English
You receive a clear picture of what's wrong, what it's costing you, and what fixing it involves. Scope and price are agreed before any changes are made.
Remediate — implementation
The agreed work, done properly: authentication records aligned, systems configured, deliverability repaired. Changes documented as they're made.
Verify — proof it works
Tests and reports demonstrating the result — authenticated mail, passing checks, measurable improvement. You see the evidence, not just my word.
Engage — ongoing relationship
Where it makes sense: monitoring, maintenance and defined response windows, so problems are caught before your sender reputation pays for them.
Using this site
The blog carries the working knowledge: authentication, deliverability, and the systems behind both.
Check your own domain's authentication records, and cost out platforms before committing to one.
Consultations, retainers and managed services are arranged directly — contact to discuss further.
Free conversation. Honest assessment. No obligation.
Straightforward guides and updates on authentication, deliverability and overall strategy.
A bounced email looks like one lost send. It isn't. Hard vs soft bounces explained in plain English — and why your sender reputation pays for every one of them.
Aggregate reports arrive as unreadable XML. This is the reading order — which fields matter, which to ignore, and what each finding means for your next move.
New sending infrastructure has no reputation — which receivers treat as suspicious. This is the staged process for building reputation deliberately, and the mistakes that burn it in week one.
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.