Sender Score

Joran Hofman
April 4, 2021

What is Sender Score?

Sender Score refers to the degree of reputation given to an IP address as an email sender.

It is very useful in email marketing because it can help you to know, among other things, if the sender of an email is a spammer or if your IP address has a low Sender Score, which would affect your Email Deliverability.

Different paid or free tools analyze different factors to determine the sender score of an IP address, such as bounces, emails sent, sending frequency, among others.

How do I Check my Sender Score?

Checking your Sender Score is very easy; you just need to have at hand your email, your IP address, and one of the tools that exist in the market to do it such as, Barracuda Central, Google PostMaster Tools, Microsoft SNDS, Trusted Source, ReputationAuthority, Senderbase, etc.

If you decide on a free tool, here's how you can do it with

  1. Click on the following address
  1. Complete the registration process. You will receive an email to your inbox with a CTA for account activation; click on the link "Activate your account."
  2. Log in, and you can enter the IP address of a domain to determine the sender's sender score.

If you search by the domain name, you will see a page with the sender score, the volume of emails sent, and the IP addresses associated with the domain in the last thirty days.

Note: considering that the domain address and the IP address are not always the same, it may happen that a domain uses a shared IP address, just to mention one example.

How do I analyze my Sender Score?

Here is what the results obtained from the Sender Score of an IP address or domain using the free tool mean.

  • Each outgoing mail server receives a Sender Score number. This number is calculated with traditional email aspects such as spam reports, complaints, unsubscribes, external reputation, volume, number of accepted or rejected emails, acceptance rate, unsubscribe rate, etc.
  • The score given to the sender comes from the Return Path.
  • The score ranges from 0 to 100, with 0 being the lowest score and 100 being the highest.

The score obtained can determine if the domain or IP address has sent unwanted or good emails in the last 30 days.

How do I improve my Sender Score?

There are different ways to improve your Sender Score and avoid your emails not being delivered due to a low score. Some of them are the following:

  • Authenticate your email to avoid being spoofed by using methods such as DKIM (Domain Keys Identified Mail), SPF (Sender Policy Framework), and DMARC (Domain-based Message Authentication, Reporting, and Conformance).
  • Build your list organically. To do so, you can ask your subscribers to confirm their subscription (double opt-in), notify people that they are being added to a subscription list, etc.
  • Update your mailing list regularly to avoid bounces, unsubscribes, or others. 
  • Focus on giving readers dynamic, entertaining, and quality content to increase the number of clicks, opens, and responses, try optimizing subject lines, changing the frequency of sending, and including within the content CTAs that generate an effective response.

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