What factors influence domain reputation?

Think of domain reputation as your domain's credit score with mailbox providers. It's built up over time based on everything you do as a sender, and it's what Gmail, Outlook, and other providers look at first when deciding whether your email belongs in the inbox.

It's not a single number you can look up. Each provider builds its own internal score based on signals they collect about your domain. Here's what goes into it.

Authentication is the foundation. If SPF, DKIM, and DMARC aren't passing consistently, providers have no reliable way to verify the email is actually from you. That uncertainty alone is enough to hurt your placement. Get this right before worrying about anything else.

Engagement is probably the heaviest ongoing signal. When recipients open, click, and move your email out of spam, that tells providers your mail is wanted. When they delete without opening, mark it as spam, or never interact at all, that pulls your score the other way. A low open rate isn't just a marketing problem. It's a deliverability signal.

Complaint rate is the one that gets people into trouble fast. Providers like Gmail publish a threshold of 0.1% as the point where they start acting on complaints. Crossing 0.3% consistently puts you at serious risk of bulk filtering or blocking. This is the number to watch most carefully.

Bounce rate reflects list quality. High hard bounces tell providers your list is old, purchased, or poorly managed (none of which is a good look). Keeping bounces under 2% is a reasonable target.

Spam trap hits are another list hygiene signal. If your emails are landing on addresses that exist only to catch bad senders, that's a sign your list has problems that go beyond unengaged subscribers.

Sending consistency also matters. Sudden volume spikes after a long quiet period look suspicious. Providers prefer senders who send predictably. If you need to scale up, do it gradually so the pattern doesn't trigger filters.

Content and link reputation round things out. Spam-heavy language, misleading subject lines, or links pointing to low-reputation domains can all add friction to delivery. The domains you link to carry their own reputation, and that reputation touches yours.

One thing worth knowing: these signals don't reset overnight. A period of high complaints or spam trap hits leaves a mark that takes consistent good sending to recover from. There's no quick fix, but there is a clear path: clean your list, keep authentication tight, and give your domain time to rebuild.

Not sure where your domain stands right now? Our free blocklist checker is a good first look. Or if you want to go deeper, reach out and we'll take a look together.