Guide to Dedicated Sending Infrastructure

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If you send emails with Klaviyo, you do not need to take any action to update your DNS records for your general deliverability setup. Rather, when you sign up, we automatically configure these records for you. That said, there are some cases that go beyond general deliverability where updates to your DNS records are required:

In this article, we will dive deeper into each of these dedicated sending options.

Why Sending Infrastructure is Important

In the world of email marketing, your sending infrastructure is very important. Inbox providers, like Google and Hotmail, determine whether to block, filter, or deliver your emails based on the reputation of your sending infrastructure.

If you want to use dedicated infrastructure, it's important that you update your DNS records. Inbox providers work hard to make sure mail that appears to be delivered from you actually is delivered from you. They do this by comparing records that are automatically added to your email to the DNS records on your website. As a result, to ensure your emails are delivered, you need to update your records.

Using a Dedicated Sending Domain 

By default, Klaviyo sets up records that ensure your emails will be delivered to your recipients. For example, on Gmail, your recipients may see that your sender email address includes "via"


By having your sending domain to match your company's website address, you can remove this message entirely.


If you're interested in using a dedicated sending domain, please see our article on how to set up a dedicated sending domain.

Dedicated vs. Shared Sending Domain

More sophisticated inbox providers look closely at the reputation of your sending domain, which is a measure of engagement among recipients who receive emails using a specific sending domain.

Shared sending domains contain a root domain that is shared among multiple Klaviyo accounts. Klaviyo automatically adds a unique element to sending domains to make it easier for more sophisticated inbox providers like Gmail and Hotmail to identify each sender as different.

There are two main benefits of using a shared sending domain:

  1. You do not have to update any records. When you sign up for Klaviyo, you can start sending immediately.
  2. You benefit from a much bigger volume of emails sent on a shared sending domain, which establishes a more powerful reputation than a sender could establish on their own.

The potential negative of using a shared sending domain is that your reputation among each inbox provider could be influenced by other senders. Klaviyo has a sophisticated architecture that removes bad senders from our platform and reduces the impact of poor performers on an individual sender's reputation, so there should be no impact.

Dedicated sending domains use the root domain of a business, instead of a root domain supplied by Klaviyo. The benefit to using a dedicated sending domain is that only one sender has an impact on the reputation, however, this can also potentially be a negative depending on the behavior of the sender.

The negatives of using a dedicated sending domain are as follows:

  1. You must slowly warm the sending domain
  2. You must update your DNS records

Using Dedicated Click Tracking

Dedicated click tracking allows you to display your own domain on click tracking links as opposed to the default Klaviyo encoding. For example, the image below shows the default Klaviyo encoding of a click tracking URL. This is what a customer will see if they hovered over a link in one of your Klaviyo emails.

Please see our guide on how to set up dedicated click tracking.

Dedicated IP Address vs. Shared IP Address

Inbox providers look at the reputation of the IP address that a given sender uses when sending a message. Reputation is determined by the engagement among recipients who receive emails from an IP address.

Shared IP addresses are used by multiple Klaviyo accounts. Klaviyo has developed a sophisticated underlying infrastructure that automatically groups senders of similar performance together and assigns shared IP addresses to them. So, accounts using a shared IP address will be sharing that IP address with other senders of similar performance.

The benefits of using shared IP addresses are as follows:

  • The IP address will carry an established reputation that is measured across more emails than any one sender would send on their own.
  • Klaviyo's Compliance team monitors the IP address and curates which accounts are entitled to send with it.

The only potential downfall of using shared IP addresses is that you are not in total control of the reputation. Klaviyo takes email sending performance and sending infrastructure reputation incredibly seriously. We have automated systems that remove bad senders from the platform and group like senders, so this potential negative is mitigated on Klaviyo.

Dedicated IP addresses are used by managed accounts on Klaviyo and are only used by one account. The benefit of using a dedicated IP address is that the reputation of the IP address can only be influenced by the single account that is using it.

The negatives of using a dedicated IP address are:

  • You must update DNS records.
  • You must send a high volume of monthly emails to establish a reputation.

Warming Your Infrastructure

When you introduce a dedicated element of sending infrastructure, it's important that you appropriately warm it up. Warming a sending domain or IP address means that you introduce that new element to inbox providers. Each inbox provider has a different algorithm that looks at the combination of your sending "fingerprint" which is made up of the following elements:

  • Sending domain
  • IP address
  • Click tracking domain
  • Sender email address

Warming a new sending infrastructure gives the inbox providers' algorithms an opportunity to adjust to this new piece of infrastructure. By default, inbox providers tend to be skeptical of new sending elements and will bias towards placing those emails in the spam folder. However, if they see your sending volume increase slowly and engagement stay high, then a strong sending reputation will be established. By starting slow, you can adjust your sending behavior if you experience bad engagement before a negative reputation is set on the new sending infrastructure.

Learn how to warm your sending infrastructure.

What to Expect

Using dedicated sending infrastructure is not an overnight fix to deliverability woes. On the contrary, using dedicated sending infrastructure is an overt investment that you make as a sender to reap the benefits of fantastic email sending performance.

As you continue to invest in acquiring quality subscribers and removing unengaged subscribers, the reputation of your sending infrastructure will continue to improve and the percentage of your messages that go straight to the inbox will outpace your competitors.

Whether you're using shared or dedicated infrastructure, sending to unengaged subscribers and earning poor performance in your email sending is a surefire way to see more emails get filtered to the spam folder. Whereas, if you invest in healthy lists, your performance will improve. When your performance improves, your reputation gets stronger. When your reputation gets stronger, your inbox placement improves. When your inbox placement improves, your performance improves. This is the virtuous cycle of successful email marketing.

Additional Resources

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