Why it works
Authentication decides whether a receiver will accept your mail at all.
It breaks quietly, when somebody adds a tool and nothing announces it.
Everything downstream of it is wasted while it is wrong.
- Use it when
- Before any reactivation work, and before blaming the copy.
- Skip it when
- You checked it this week and nothing has changed since.
- What to watch
- Your own records, and whether they still say what they said last month.
- What it costs you
- A policy tightened without watching the reports can stop legitimate mail.
Put your own numbers in
There is no figure here for what this does. Nobody knows what it does on your list.
Email Authentication Checker