Help & docs
How every part of Inbox Decay works, in plain English. These docs grow from real questions — ask one, and the answer often becomes a page here.
Getting started
Getting started: from signup to your first verdict
What happens when you sign up, what the instant check covers, and the one thing to do next to get the full picture of your sending.
Your test email address
Every workspace gets a permanent address on checkinboxdecay.com. Send to it from your email tools and we trace what the filters actually see.
Adding and managing domains
The three ways domains enter your workspace, how subdomain suggestions work, why mailbox-provider domains are excluded, and bulk tools for many domains.
Understanding your results
The verdict, scores and traffic lights
How the go/no-go verdict is decided, what the three score tiles mean, and where the color thresholds sit.
Every check, explained in plain English
The complete list of what Inbox Decay checks on your domains, your sending paths and your emails, and why each one affects whether you land in spam.
What a sending path is
Why Inbox Decay scores each route your email travels separately, and why one tool can be healthy while another quietly fails.
Monitoring & fixing
Monitoring, alerts and what decay means
How often your setup is re-checked on each plan, what triggers a break alert, and why a one-time pass isn't the end of the story.
Fix actions and the Action Items list
How the Fix button works, where action items come from, and what closing one actually does.
Importing ESP performance data
Bring open and engagement numbers from your email tool into Inbox Decay, mapped to the sending path they belong to.
Allowances, limits and what happens over them
What plan allowances cover, what actually happens when you reach one, and why your data never stops being collected.
Troubleshooting
Contact support
A human reads every message. Include your workspace email and the domain in question and you'll usually have an answer within a business day.
One-off domain questions don't need an account: the free checkers answer them instantly, and Decay University teaches the deliverability behind them.