Shared vs dedicated IP is really a question of who else's sending behavior affects your deliverability — and the right answer changes as volume grows, which is why this shouldn't be a one-time decision made at the start of a sending operation.
A shared IP pools your sending with other senders on the same infrastructure — cheaper and requires no dedicated warmup, but your reputation is partially tied to strangers' sending behavior. A dedicated IP isolates your reputation completely — every signal an inbox provider sees on that IP reflects only your own sending — at a real cost in both money and setup time.
| Monthly volume | Recommendation |
|---|---|
| Under 50,000 emails/month | Shared IP is fine |
| 50,000–150,000/month | Evaluate based on sending platform's shared pool quality |
| 150,000+/month | Dedicated IP — not optional at this scale |
At sustained high volume, "your sending reputation is your business" stops being an abstraction — every email sent from a dedicated IP reflects only your own behavior, which is exactly the level of control an agency or business sending at real scale needs, per our agency tech stack guide.
Don't switch to dedicated IP before you have the volume to justify the warmup cost. A dedicated IP sitting mostly idle during its 4-8 week warmup, then sending at low volume afterward, wastes the isolation benefit it exists to provide. Match the switch to genuine volume growth, not to a general sense that dedicated must be "better" in every situation.
It depends on volume. Shared IP works fine under roughly 50,000 emails/month. Past 150,000/month, dedicated IPs are generally considered not optional, since your sending reputation is isolated from every other sender's behavior.
Roughly 4-8 weeks, longer than a typical domain warmup period, since the IP itself needs to build a sending history before inbox providers trust it at full volume.
If another sender on the same shared pool engages in spammy behavior, your deliverability can take a hit through no fault of your own — you have limited ability to control or diagnose a shared IP's reputation directly.
Typically an additional $30-$100/month on top of a standard sending platform subscription, plus the setup time for its own warmup period before it reaches full sending confidence.
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Written by
Scott Holmes
AI systems consultant based in Barrie, Ontario. Founder of Pinnacle Tech Projects. Has managed both shared and dedicated IP sending infrastructure for cold email at various volume levels.
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