How can I check my sender reputation?

There is no universal dashboard. Each provider exposes only a fragment of the data.

The most important free tools are Google Postmaster Tools for Gmail related reputation and Microsoft SNDS for Outlook and Hotmail related signals. Third party monitoring platforms can also provide limited visibility.

You can also infer reputation from engagement trends, spam placement, and bounce patterns.

Checking reputation is like watching the sea conditions around your ship. You cannot control the current. You can only read it.