What is a dedicated sender?
A dedicated sender is sending capacity reserved for one customer rather than shared with everybody on the platform. It matters because the sending history attached to it is yours alone, which is what makes one campaign predictable from the behaviour of the last one.
On this page
The phrase gets used loosely enough that two providers can mean opposite things by it. This page sets out what a dedicated sender actually is, what it is not, and the two situations where paying for one changes the outcome of a campaign.
What does dedicated actually mean here?
It means the sending capacity your messages leave from is reserved for you, rather than pooled with every other customer on the platform. Nobody else’s campaign contributes to the history attached to it.
On a shared pool the opposite is true. Your messages leave alongside thousands of other senders, and a bad week from somebody you have never met is part of the record your campaign is judged against.
Why does ownership of the history matter?
Because receiving mail servers make decisions about a sender based on how that sender has behaved. On a shared pool that behaviour is an average of strangers, which is why the same campaign can perform differently in two consecutive weeks for no reason you can see.
With a dedicated sender the only campaigns in the record are yours, so what happened last time is a usable prediction of what happens next time. That is the whole value, and it is a reporting benefit as much as a delivery one.
Is a dedicated sender the same as your own domain?
No, and confusing the two is the most common mistake. Your own domain makes you the owner of the identity and of everything that happens to it, including the complaints.
A dedicated sender on somebody else’s infrastructure gives you the separation without the ownership of the downside. At PhantomFox the sender is warmed before you touch it and the unsubscribes and the spam reports a campaign generates land on our sending infrastructure, not on any address of yours.
| Option | Who shares the history | Who carries a bad campaign |
|---|---|---|
| Shared pool | everyone on the platform | everyone, including you |
| Dedicated sender here | only you | our sending infrastructure |
| Your own warmed domain | only you | you, for months |
| A personal mailbox | you and your employer | your daily mail |
When is a dedicated sender worth paying for?
When volume is high enough that the pool’s average is doing real damage to your reading of the results, or when the sending is for clients and each client needs to be judged on their own campaigns rather than on each other’s.
Agencies reach that point first, which is why dedicated sender for cold email agencies exists as its own page. A solo marketer sending one campaign a month rarely needs it and should spend the money on the list instead.
How long does one take to set up?
On a normal provider, weeks, because a dedicated sender has to be warmed before it can carry volume and that warm up is the slow part rather than the provisioning.
Here it is not a wait at all. The senders are pre warmed before you touch them, so the first campaign sends at the rate the hundredth does, and a dedicated setup can be stood up for you if you would rather not run it yourself. The commercial side is on pricing and the done for you route is dedicated sender.
If you are still deciding whether you need one, read how to send bulk email without a domain first, then how to test a campaign without risking a domain, and browse the rest from the answers hub.