Sender Reputation
Sender reputation is the score that Gmail, Yahoo, Microsoft and other mailbox providers keep on your sending domain and IP address. It is built from how people respond to your email over time: whether they open it, reply, delete it unread, mark it as spam or bounce. A good reputation gets you into the inbox. A poor one gets you filtered, even when the email itself is fine.
Why it matters for a small business
Your reputation follows your domain, not your email platform. Switch platforms and the history comes with you. That means a few careless sends, like blasting an old purchased list or emailing contacts who have not heard from you in three years, can hurt every email you send for months, including invoices and appointment reminders.
What builds or damages it
- Helps: consistent sending, people who asked to hear from you, replies, low bounce rates, proper authentication.
- Hurts: spam complaints, hard bounces, spam trap hits, sudden volume spikes and long stretches of silence followed by a big send.
A real-world example
A retailer goes quiet for a year, then sends a holiday promotion to its full list of 12,000 contacts. About 8 percent bounce and dozens of people mark it as spam because they forgot who the store was. Gmail treats the domain as suspicious, and the next few campaigns land in spam. A better approach would have been to clean the list first and restart with the most engaged contacts, then widen the send over a few weeks.
How to check yours
Set up Google Postmaster Tools for your domain to see your reputation and spam rate at Gmail. Watch your bounce and complaint numbers in your email platform after every send. If either starts climbing, pause and find out why before the next campaign.
Related reading: List health automation and why emails go to spam. To protect or repair your reputation, see our email automation and deliverability service.
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