How to decide between a dedicated or shared ip for email marketing

Choosing between dedicated and shared IPs for email marketing? Here's how to decide based on your monthly send volume, budget, and need for reputation control — and why your contact count isn't the right metric to use.

How long does it take to warm up a dedicated IP?

In HubSpot, the automated warm-up process takes 40 days, during which traffic is incrementally shifted from shared to your dedicated IP — this is HubSpot-specific and other providers may use different timelines. Rushing or skipping warm-up significantly increases the risk of landing in spam.

What does a dedicated IP actually cost?

Costs vary widely by provider: Amazon SES charges $24.95/month per IP, Mailchimp charges $29.95/month, and HubSpot charges $300/month as an add-on to Professional or Enterprise plans — meaning the range runs from roughly $25 to $300+/month depending on your ESP.

Can switching to a dedicated IP fix my deliverability issues?

Not on its own — if list quality, email authentication (SPF, DKIM, DMARC), and engagement aren't in good shape, a dedicated IP won't save you. Fix the fundamentals first, then evaluate whether dedicated infrastructure makes sense for your volume.

Are shared IPs on major ESPs actually risky?

Not necessarily — reputable ESPs like HubSpot actively manage and monitor their shared IP pools to maintain quality, meaning well-managed shared IPs often deliver strong inbox placement for senders following good practices, as Seventh Sense notes from experience with HubSpot's infrastructure.

How to Choose Between Dedicated and Shared IP for Email Marketing

Here's the deal: in 2024, 1 out of every 6 marketing emails never reached the recipient's inbox. That's a broad industry average — senders on well-managed ESP shared IP pools often do better — but it's a reminder that infrastructure decisions aren't trivial. (Source: Validity, 2025 Email Deliverability Benchmark, via Batch)

The decision between dedicated and shared IP comes down to monthly send volume, budget, and how much control you need over your sender reputation. Note: every credible source on this topic uses monthly send volume as the gating metric — not contact list size. That distinction matters for you.

First, Do the Math on Your Actual Send Volume

You have 80,000 contacts and send a few times per week. Run the numbers: 80,000 contacts × 3 sends/week × 4 weeks = roughly 960,000 emails per month. Even at 2 sends/week you're looking at ~640,000/month. That puts you well above most published thresholds — which means the "you're probably fine on shared" advice you've heard may not apply to your situation at all.

What the Sources Actually Say About Thresholds

There's a real disagreement between sources here, and you should know about it rather than get a false consensus:

Batch sets the threshold at 500,000 emails per month (with at least 5,000–10,000 per day consistently). Below that, they say a shared IP is generally sufficient.
Infraforge (a dedicated IP vendor, so weigh accordingly) puts the financial tipping point lower, at 100,000–200,000 emails per month, where fixed dedicated IP costs start making more sense per-email.
Knak notes that Marketo's dedicated IP eligibility requires sending more than 100,000 emails per month.

The practical takeaway: if you're sending at the volume implied by your list and cadence, you're above every threshold cited by every source. The shared-vs-dedicated question becomes genuinely worth answering carefully.

Decision Framework: Dedicated vs. Shared IP

Choose DEDICATED IP if:

Your monthly send volume consistently exceeds 500,000 emails/month (Batch's threshold) or you're above 100,000–200,000/month and prioritizing cost-per-email efficiency (Infraforge's threshold)
Email is a primary revenue channel — e-commerce, loyalty programs, high-impact CRM
Your sending schedule is predictable and stable (dedicated IPs need consistent volume to maintain reputation)
You have the resources to manage IP warm-up and ongoing reputation monitoring
Budget allows for the additional cost — typically $24.95 to $300+/month depending on provider (Amazon SES starts at $24.95/month per IP; HubSpot charges $300/month as an add-on; Mailchimp charges $29.95/month)

Choose SHARED IP if:

Your monthly send volume is genuinely low or irregular — below the 100,000–500,000/month range depending on which source's threshold you use
You want to skip the warm-up process entirely and start sending immediately
You prefer your ESP to handle reputation management across multiple senders
You want to minimize costs — shared IPs are typically included with most ESP plans at no extra charge

One honest caveat on shared IPs: your sender reputation is tied to the sending habits of every other business on that IP. If you share infrastructure with sloppy senders, your deliverability can take the hit even when you've done nothing wrong. Reputable ESPs like HubSpot actively manage their shared IP pools and monitor them for quality — which is a real advantage of staying on a managed shared pool rather than assuming all shared IPs are equal.

The Warm-Up Reality

A dedicated IP starts with zero sending history. It requires a structured warm-up period where you gradually increase volume to build reputation with inbox providers. In HubSpot specifically, this automated warm-up process takes 40 days — that's HubSpot's implementation; other providers may vary. During that window, HubSpot incrementally shifts traffic from shared to dedicated IP. Skip or rush this phase and you'll likely land in spam.

If you're considering a dedicated IP, factor in that 40-day (or equivalent) ramp-up period before you're fully independent of shared infrastructure. It's not a reason to avoid dedicated IPs, but it's a reason to plan ahead.

The Bottom Line for Your Situation

At 80,000 contacts sending several times a week, your actual monthly send volume is likely in the range where dedicated IP infrastructure becomes genuinely worth evaluating — not dismissing. Run your exact send cadence through the math. If you're consistently above 500,000 emails/month, Batch's framework points toward dedicated. If you're in the 100,000–500,000 range, you're in the zone where sources disagree and the right answer depends more on how critical email is to your revenue and how stable your sending schedule is.

And remember: switching to a dedicated IP won't fix underlying deliverability issues. List hygiene, authentication (SPF, DKIM, DMARC), and engagement quality have to be solid first — dedicated or not.