Short answer: no. There is currently no option to pin your mailboxes to a dedicated IP address or a hand-picked subset of our sending pool. All sending goes through a backend-managed IP pool that is actively monitored and rotated — and that's a deliberate deliverability decision, not a limitation.
Why we use a rotating, actively managed pool
Cold email deliverability depends much more on domain and mailbox reputation, warmup, and sending behavior than on any single IP address. Because of that, our infrastructure is built around a large pool of sending IPs that we manage on our side rather than assigning one fixed IP per customer or mailbox.
Rotation is reputation-driven, not just scheduled. We continuously track the reputation and blacklisting status of every IP in the pool and rotate IPs out whenever their reputation dips. IPs also rotate dynamically across domains on a daily basis. The result: your mail is never left sending through a tainted or poor-reputation IP.
Because rotation is frequent, a specific IP you might check today may no longer be the one your mailboxes are sending through tomorrow.
Rotation also spreads sending volume across many IPs instead of concentrating it (and any risk) on one, which improves performance and reliability.
Your account-level SPF record authorizes the pool as a whole, so you don't need to track or whitelist individual IPs yourself. Emails sent to different providers (e.g., Gmail, Outlook, Yahoo) may show different sending IPs due to routing configurations specific to each provider — this is part of the system's design to optimize delivery.
Why a dedicated IP would actually be worse
There's a widespread belief that a dedicated IP is safer because no other senders can affect its reputation. For cold outreach, the opposite is true:
Spam filters treat anyone doing cold outreach cautiously, so a static dedicated IP accumulates negative signals and burns out quickly — this is why most traditional dedicated-IP SMTP vendors didn't last.
If a dedicated IP gets blacklisted, it's game over for that IP — you're left holding a burned address, with no rotation to protect you while its reputation only deteriorates over time.
With our managed rotation, an IP that picks up a listing or a reputation dip is simply rotated out — your sending continues on clean IPs without you doing anything.
Whether you're running a handful of mailboxes or thousands, you get the same deliverability safeguards: IP protection comes from continuous monitoring and rotation, not from owning a static IP. You don't need to worry about IPs at all — we manage them entirely on our side.
What to do if a blocklist check flags an IP
If you run your own due-diligence checks (Spamhaus, SURBL, etc.) against an IP you found in our SPF record or mail headers, keep in mind that IP may already have rotated out of active use by the time you check it. A single listed IP in a large rotating pool does not mean your domains or mailboxes are affected. See One of my sending IPs shows as blacklisted for more on this, and Can you give me the IP addresses of your sending servers? if a blocklist provider is asking you for them directly.
The reliable way to check your own standing is to look up your domain (not an individual IP) against a blocklist — a point-in-time IP lookup mostly tells you about an address that may already be out of your sending path.
If you have a specific concern about a listing, contact us with the details and we'll take a look.
How to monitor your deliverability instead
Since sending IPs aren't something you manage (or need to manage) directly, the signals worth watching are at the mailbox and domain level:
Check your mailbox reputation inside your Maildoso account — see Understanding your Warmup & Deliverability Insights.
Monitor mailbox reputation and placement inside your warmup tool. These two are the most important signals for your setup.
DMARC aggregate reports and Google Postmaster verification won't add useful visibility here — mailbox reputation is the signal to watch.
What actually protects your deliverability
Focus on the parts of setup that do move the needle:
Run a proper warmup through a dedicated warmup tool (we recommend Instantly or Plusvibe) before sending real campaigns.
Keep sending volume within recommended daily limits per mailbox.
Send to a clean, verified list — avoid catch-all and unverified addresses.
Still have questions about your setup? Contact us and we'll take a look at your specific case.