If you're scaling toward 100,000 emails per month, you're getting close to the range where a dedicated IP becomes a real conversation — but whether you actually need one depends on more than just volume, and the threshold guidance you'll find from vendors isn't consistent.
Here's the core problem a dedicated IP solves: in 2024, 1 in 6 marketing emails never reached the recipient's inbox — 10.5% were delivered directly to spam. (Source: Validity, 2025 Email Deliverability Benchmark, as cited by Batch.) When you're on a shared IP, other senders' behavior is part of your problem. If they spam, your deliverability takes the hit too. A dedicated IP gives you full isolation — you're only judged by your own sending practices, not whoever else happens to share your IP pool.
So when do you actually need one?
This is where the vendor guidance diverges, and you deserve to know that upfront rather than getting a false single number.
- Batch (a sending infrastructure provider) recommends dedicated IPs only when volumes exceed 500,000 emails per month, with at least 5,000–10,000 emails per day sent consistently. Below that, they argue shared IPs perform better because they're pre-warmed and handle irregular sending more gracefully.
- BigMailer, an email marketing platform, flags dedicated IPs as particularly relevant for high-volume senders exceeding 50,000 emails per day who are already experiencing deliverability issues — not as a blanket recommendation for everyone at that volume.
The honest summary: if you're sending 100,000 emails per month, most infrastructure providers would still put you in the shared IP camp. You'd need to be sending significantly more — and sending it consistently — before a dedicated IP starts paying off.
Why low volume kills a dedicated IP
A dedicated IP starts with zero reputation history. It requires a structured warm-up: gradually increasing volumes over several weeks so inbox providers can build a positive picture of your sending behavior. If your volume is too low or too irregular, that reputation will degrade. A cold or under-used dedicated IP can actually hurt your deliverability compared to a well-managed shared pool.
According to Batch, consistency is the deciding factor — not just peak volume, but reliable daily sending. Seasonal senders, marketers with promotional spikes, or anyone whose list hasn't reached sustained scale are generally better served by shared IPs that absorb inactivity without reputation decay.
When a dedicated IP is genuinely worth it
A dedicated IP makes sense when all of the following are true:
- Your sending volume is high and consistent — not just occasionally large
- Email is a critical revenue channel (e-commerce, fintech, loyalty programs, subscription media)
- You've already cleaned up list hygiene, authentication (SPF, DKIM, DMARC), and engagement metrics — a dedicated IP won't fix a broken program, it will just expose it faster
- You have the operational bandwidth to manage a warm-up process and ongoing deliverability monitoring
SendClean, which sells dedicated IP services, notes the benefits of isolation and control — worth flagging that they have a commercial interest in that recommendation. The structural argument still holds: full isolation means your reputation is entirely yours to build or burn. That's a feature at scale, and a risk if you're not ready for it.
The bottom line for a 100k/month sender
At 100,000 emails per month, you're likely not at the threshold where a dedicated IP meaningfully outperforms a quality shared pool — especially if your sending isn't perfectly consistent day over day. Focus first on authentication, list hygiene, and engagement segmentation. Revisit the dedicated IP question when you're approaching 500,000 emails per month with reliable daily volume to back it up.
Sources
- Batch — Shared IP vs Dedicated IP: Which Is the Right Choice for Your Email Deliverability?
- SendClean — Dedicated IPs: Take Control of Your Email Deliverability (vendor source; SendClean sells dedicated IP services)
- BigMailer — Dedicated IP for Email Marketing: Do You Need It? (vendor source; BigMailer is an email marketing platform)