Getting an email to the inbox starts with the IP address. Not the IP itself, but the sending reputation tied to it.
Inbox providers like Google, Office 365, and Yahoo track the mail coming from each IP address. Some of the signals they watch:
- Does the email get opened?
- Does the recipient delete it straight away?
- Does an unsubscribe follow?
- Does the recipient click a link?
- Does the recipient mark the message as spam?
- Is the IP listed on a reputable blacklist service such as SpamHaus?
And many more granular interactions beyond these.
From those behaviours, an inbox provider forms a reliable view of how much recipients want your mail. That view becomes your reputation.
If you already have an IP, check its reputation at SenderScore. The score runs from 0 to 100. Closer to 100 is better.
Reputation also affects delivery speed. If a large share of your list is on Gmail, you need your mail to arrive on time. A poor reputation can delay delivery, even if the message eventually lands in the inbox.
When choosing between a dedicated IP and a shared IP pool, the question is simple: do you want to own your reputation, or share it?
Pros of a dedicated IP
- You control your own reputation. If your database is fully opted-in and your recipients engage with what you send, you are well placed to manage it independently.
- On a shared IP, your reputation is tied to every other sender on that pool. A dedicated IP cuts that risk.
- You build and maintain your own reputation over time.
Cons of a dedicated IP
- A new dedicated IP needs to be warmed up before it reliably reaches the inbox. Your ESP should ideally hand you a pre-warmed IP to start with.
- Delivery speed will be slow initially and improves as reputation builds.
- Spam traps and complaints hit harder on a dedicated IP. If your subscribe form is not double opt-in or protected by reCAPTCHA, a single spam trap on your database can cause real damage.
- On a shared IP pool, your ESP handles blacklist monitoring and delisting. On a dedicated IP, that falls on you. You will need to manage your own delisting on public blacklist services.
- Dedicated IPs usually come at an added cost.
If you send clean data, your list is opted-in, and you have spam trap protection in place, a dedicated IP is a net positive. The pros outweigh the cons.
If you suspect your ESP's shared infrastructure is hurting your delivery, reach out and we can run some tests, handle the warm-up, and assess whether a dedicated IP would solve the problem. In many cases, it does.
Email solutions@touchbasepro.com to talk through whether a dedicated IP makes sense for your sending setup.
Frequently asked questions
- What is sending reputation and why does it affect deliverability?
- Sending reputation is a score that inbox providers like Gmail and Yahoo assign to your IP address based on how recipients interact with your mail. High engagement, low spam complaints, and clean list data push your reputation up. A strong reputation means faster, more reliable inbox delivery.
- How do I check my IP's sending reputation?
- Go to SenderScore (senderscore.org) and enter your IP address. The score runs from 0 to 100. A score closer to 100 indicates a healthy reputation.
- What does warming up a dedicated IP mean?
- A new IP has no history with inbox providers, so they treat it with caution. Warming up means starting with low send volumes and gradually increasing them so providers can build a positive picture of your sending behaviour before you ramp to full volume.
- When does a shared IP pool make more sense than a dedicated IP?
- A shared IP pool is often the better choice for senders with lower volumes, newer lists, or limited resources to manage blacklist monitoring and warm-up themselves. Your ESP handles reputation management on your behalf, which reduces overhead.