What are the components of email reputation?

Your emails didn't just land in spam because of one thing. Email reputation is a composite score built from several signals that mailbox providers weigh together every time your message arrives at their door.

Here are the main components:

• Authentication. Do your SPF, DKIM, and DMARC records pass? This is the baseline. Providers won't trust the rest of your signals if your emails can't prove who sent them.
• IP reputation. The sending server's history. Shared IPs mean you inherit the behavior of every other sender on that IP. Dedicated IPs mean your reputation is entirely your own to build (or burn).
• Domain reputation. The trustworthiness of your sending domain, built up over time. This is increasingly the signal providers weight most heavily, especially at Gmail.
• Engagement signals. Opens, clicks, replies, and forwards tell providers that real people actually want your mail. Low engagement over time is a slow leak in your reputation.
• Complaint rates. Every time someone hits "This is spam," it counts against you. Gmail and Yahoo Mail both publish thresholds (0.10% is where you start getting hurt, 0.30% is where things go sideways fast).
• List quality. Bounces and spam trap hits signal that you're sending to addresses you shouldn't have. High bounce rates hurt both your IP and domain reputation quickly.
• Sending patterns. Sudden volume spikes or irregular sending behavior look suspicious. Consistent, predictable sending is always better.

None of these signals works in isolation. A clean authentication setup won't save you if your complaint rate is high. Strong engagement won't fully compensate for spam trap hits. Providers look at the whole picture.

If you're trying to figure out which component is actually hurting you right now, start with the easiest one to check. Authentication either passes or it doesn't. You can verify your setup in under a minute with our free SPF checker and DKIM lookup. If those are clean, the next place to look is your complaint rate and bounce rate inside your ESP dashboard.

Want to go deeper? The difference between IP and domain reputation is worth understanding, because fixing the wrong one wastes time.