Warming up
Agencies don't run one mailbox. They run ten, fifty, or a hundred — across client domains, managed at scale. The economics of warmup look completely different when you're responsible for all of them.
Most warmup tools were designed for a single founder with one sending domain. They work at that scale. They get expensive, complicated, and unpredictable the moment you're managing deliverability across multiple clients.
Most warmup tools charge per mailbox. That made sense when a solo sender was warming one domain. For an agency managing multiple clients, the maths breaks quickly.
Ten mailboxes at $20 per mailbox is $200/month before you've written a single sequence. At 50 mailboxes, you're spending more on warmup than most agencies spend on their entire stack. And all of that spend is going to the same underlying process: generating peer traffic to tell Gmail and Outlook that a mailbox belongs to a real person.
Warmerly charges a flat monthly rate. Connect ten mailboxes or a hundred — the price stays the same. For agencies managing multiple clients, that predictability matters as much as the warmup quality itself.
Most warmup tools are designed for solo senders. They work, but the workflow doesn't scale:
An agency needs something different. You need to see all your client mailboxes in one view, get alerted when something breaks, and know that warmup quality is consistent across all of them — not just the ones you happened to check today.
The fundamentals are the same regardless of scale: real peer traffic, spam-folder rescue, quoted replies, and positive engagement signals. The difference at agency scale is consistency and continuity.
When a client domain goes quiet for two weeks between campaign batches, reputation decays. When a new client sends from a fresh domain before warmup is complete, deliverability collapses. When an authentication record breaks and nobody notices for a week, the entire client pipeline stops working. Good agency warmup accounts for all three.
Warmerly is warmup-only. It connects to your clients' Gmail and Outlook mailboxes via OAuth, runs the warmup engine in the background, and surfaces health data in a single dashboard. It does not touch your campaign tool, your sequences, or your client's primary business mail — it just handles the reputation layer underneath.
That separation matters for agencies. You can use Warmerly alongside Apollo, Instantly, Smartlead, lemlist, or any other sending tool your clients use. The warmup mailbox is the same mailbox your campaign tool sends from — Warmerly just makes sure it's in good standing before and during each campaign.
Warmerly at $19/month flat covers every mailbox you manage, plus LinkedIn outreach. If you currently pay per-mailbox pricing elsewhere, calculate what you spend for 20 or 50 mailboxes. The difference usually pays for several months of Warmerly.
These come up in almost every agency audit.
Every feature below is available on every plan, including the starting tier.
Add every client mailbox you manage. Warmerly's flat monthly price doesn't change as you grow. No per-seat negotiations, no surprise bills at end of month.
Warmerly checks SPF, DKIM, DMARC, and MTA-STS every day for every connected mailbox. If a record breaks or goes missing, you get a remediation note before it affects deliverability.
When peer warmup messages land in spam, Warmerly moves them out within 10 minutes. The fast rescue window matters because Gmail's reputation snapshot is influenced by folder state at the time of the daily update.
Placement seeds run across Gmail, Outlook.com, Microsoft 365, Yahoo, and a fifth provider. Agencies targeting enterprise buyers need Outlook placement data, not just Gmail numbers.
Every reputation event is logged with a timestamp and context. When a client asks why their reply rate dropped last Tuesday, you have the data to answer them.
Warmerly is warmup-only. It runs in parallel with Instantly, Smartlead, Apollo, lemlist, or any tool you already use. No migration, no routing changes.
Connect a mailbox in 60 seconds. Warmerly starts monitoring immediately and begins the warmup sequence automatically.
Your plan includes a set number of mailboxes — 5 on Starter, 25 on Growth, 50 on Agency — and warmup is included on every one of them at no extra charge. There are no per-seat charges, no warmup add-on, and no send quotas to buy back.
Yes. Warmerly connects via Google OAuth for Gmail and Google Workspace mailboxes, and Microsoft OAuth for Outlook.com and Microsoft 365. Both are fully supported on every plan.
Yes. Warmerly only warms the mailbox. Your campaign tool — whether that's Apollo, Instantly, Smartlead, lemlist, or anything else — runs from the same Gmail or Microsoft account. There's no routing conflict and no DNS change required.
Add and remove mailboxes freely. The flat monthly rate covers your account regardless of how many mailboxes are active at any given time. You won't be billed differently for adding a client mid-month.
Disconnect the mailbox from your current warmup tool, then connect it to Warmerly via OneMail's Google or Microsoft OAuth flow. Choose a ramp schedule that matches the current send volume. Mailbox reputation lives at Gmail and Microsoft, not at the warmup tool, so nothing is lost in the switch. Each mailbox takes about 2 minutes.
Yes. Warmerly monitors SPF, DKIM, DMARC, and MTA-STS daily for every connected mailbox. If a record is missing, misconfigured, or changes unexpectedly, you'll receive an alert with remediation steps — before it causes a deliverability problem.
SDRs and AEs depend on cold email delivering to the inbox. One domain deliverability problem doesn't stay isolated — it can affect the reply rates of everyone on the team sending from the same domain.
Recruiters live in two channels at once: email to candidates and clients, and LinkedIn to everyone. When the mailbox spam-folders or the LinkedIn account gets throttled, the pipeline stops — and you usually find out a week too late.
Connect a mailbox in 60 seconds. 7-day free trial, card required, no charge until day 8. Cancel any time before then.