Sender Reputation Checker

Email sender reputation is a trust score that mailbox providers like Gmail, Outlook, and Yahoo assign to your sending domain and IP address. It is calculated based on your sending history, bounce rates, spam complaint rates, and recipient engagement metrics. A high sender reputation means your emails are more likely to reach the inbox, while a low score can cause your messages to land in spam or be blocked entirely.

You can check your email sender reputation using free tools like our Sender Reputation Checker, which evaluates your domain's authentication setup (SPF, DKIM, DMARC), blacklist status, DNS configuration, and mail server infrastructure. For provider-specific data, use Google Postmaster Tools for Gmail reputation and Microsoft SNDS for Outlook. We recommend checking your reputation at least monthly, especially if you send high volumes of email.

A sender reputation score of 80-100 is considered good to excellent, and senders in this range typically see strong inbox placement rates. Scores between 70-79 are fair but indicate room for improvement, while scores below 70 are poor and often result in emails being filtered to spam. Our tool grades your domain from A to F, with A (90-100) being excellent and F (0-39) indicating critical issues.

IP reputation is tied to the specific mail server IP address used to send emails, while domain reputation is linked to your sending domain and follows you even if you change email service providers. Modern mailbox providers like Gmail now prioritize domain reputation over IP reputation because domains are harder to swap and more closely tied to brand identity.

Emails land in spam primarily due to poor sender reputation caused by high spam complaint rates, high bounce rates, low recipient engagement, or missing email authentication (SPF, DKIM, DMARC). Check your sender reputation score, verify your authentication records are properly configured, clean your email list of invalid addresses, and focus on sending only to engaged subscribers.

SPF, DKIM, and DMARC are email authentication protocols that verify you are an authorized sender for your domain. SPF confirms emails come from authorized servers, DKIM adds a cryptographic signature to prove the message was not tampered with, and DMARC tells receiving servers how to handle emails that fail checks. Since 2024, Gmail and Yahoo require all bulk senders to have all three in place.

Rebuilding a damaged sender reputation typically takes 2-8 weeks depending on the severity of the damage. The recovery process involves fixing the root cause (cleaning your list, reducing complaints, configuring authentication), then gradually warming up your sending volume starting with your most engaged subscribers. IP reputation tends to recover faster (2-4 weeks) than domain reputation (6-12 weeks).

Yes, completely free. No signup, no email required, no limits on basic usage. We believe every email sender should have access to reputation monitoring tools. Our tool analyzes publicly available DNS data and blacklist databases to generate your Sender Reputation Score.

The most impactful factors are spam complaint rates (keep below 0.1%), bounce rates (stay under 2%), recipient engagement metrics (opens, clicks, replies), and proper email authentication setup (SPF, DKIM, DMARC). Spam complaints are the single fastest way to damage your reputation. Additionally, hitting spam traps and appearing on blacklists will severely harm your score.

You should check your sender reputation at least once per week if you send emails regularly, and immediately if you notice a sudden drop in open rates, increased bounce rates, or delivery failures. For high-volume senders (more than 5,000 emails per day), daily monitoring is recommended to catch and address issues before they significantly impact deliverability.