Field notes on email, deliverability, and the engine.
Honest writing from the team that builds CleanMyList. Mostly engineering. Sometimes deliverability playbooks. Occasionally a rant about the state of the category.
More articles
What we have been writing recently.
- Engineering
Catch-all domains: the quiet killer of cold outreach
Why a domain that accepts every address is the trickiest signal in email verification, and how we score it without lying to you.
Theo Lindgren9 min read - Deliverability
The real cost of a single bounce
Sender reputation is a slow ladder up and a fast slide down. A look at how one bad send compounds across a quarter.
Aren Castillo6 min read - Engineering
Why Gmail intentionally lies to verifiers
Large mailbox providers obscure mailbox existence on purpose. Here is how we work around it without sending real mail.
Sasha Pereira8 min read - Playbooks
A quarterly playbook for list hygiene
The 4-step routine our customers run every 90 days to keep bounce rates under 1% and avoid the Gmail spam folder.
Maren Okafor5 min read
One email a month. Practical, not promotional.
Our newsletter has a 12-month archive of deliverability playbooks. We will not send you anything else.