My client noticed before I did
A client asked about the drop before you had an explanation. Looking back, you had been billing for a working service while delivery slipped for weeks.
- 213K mailboxes under management
Weeks of billing before the question arrives
The question comes from the client
Someone asked about the drop before you had an explanation. You answer with a promise to look into it, on a call you expected to be routine.
The number you watch moves last
Reputation can slip and placement can shift at one provider while replies hold for a few more weeks. Across hundreds of domains checked by hand, a slipping one can go unseen.
Clients leave when delivery slips
The weeks before the question were billed as a working service. Even after the fix, the client remembers who noticed first.
One slipping client, two different months
An example monthWatching the reply rate
Reputation slips on one of Northwind's domains.
Placement shifts at one provider. Replies still hold.
Northwind asks about the drop.
You explain, after the fact.
Risk Level flags the mailbox while Northwind's numbers look normal.
Northwind is the first row in your agency view. You rest the domain and promote a backup.
Placement holds on the rest of Northwind's domains.
Northwind never had to ask.
Know before your client does
Risk Level flags a mailbox ahead of replies
Risk Level is built from sending data and flags a mailbox ahead of your reply rate, on every vendor you use. You can act on the flag while the client's numbers still look normal.
- On every vendor you use
- Seven checks per domain, every day
- Filter down to the last sixty minutes
- Week 1 · reputation slipsRisk Level can flag the mailbox here
- Week 3 · placement shiftsThe placement check turns amber
- Week 5 · replies dropThe point where a client usually notices
One view across every client
Each client gets a workspace with their mailboxes, domains and risk levels walled off. You get one view across all of them, so the client with a slipping domain is the first row you read.
- A workspace per client
- Risk levels per mailbox
- One view for the agency
| Workspace | Status |
|---|---|
Northwind14 domains · 2 flagged | At riskAhead of reply rate |
Halligan9 domains · 1 warming | ReadySend anytime |
Internal6 domains · 2 backup | ReadySend anytime |
Northwind: Risk Level flagged 2 domains. Replies have not dropped yet. Do: Rotate in backups before the client sees it.
Teams running outbound on sending.ac

Can confirm. We actually tested them, and performed next to Winnr the best. Good on Yannic Schwock

Setup was fast, DNS and DKIM handled automatically, and each domain runs on its own isolated tenant so a burned domain stays contained.
Btw, you guys have the smoothest UX/UI of all the inbox resellers I’ve purchased from. And I’ve worked with ALL of them.
Know before your client does
A workspace per client
Each client's mailboxes, domains and risk levels stay walled off, with one view across all of them.
Risk Level flags ahead of replies
Built from sending data, on every vendor you use, while the client's numbers still look normal.
Act before the question
Rest the domain and promote a backup, and the client's campaign keeps sending.
Questions agencies ask
Most of these are faster on a 15-minute call with someone who already knows the answer.
Talk to an advisorHow early can Risk Level flag a mailbox?
It is built from sending data and flags a mailbox ahead of your reply rate, so you can act while the client's numbers still look normal.
Can one client see another client's data?
No. Each client gets a workspace with their mailboxes, domains and risk levels walled off from everyone else's.
What does the agency view show?
Every client's workspace in one place, with risk levels per mailbox, so the client with a slipping domain is the first row you read.
What happens when a client's mailbox burns?
Risk Level flags it from sending data before the reply rate shows it. Mailbox insurance replaces it within 30 days at no extra cost, even if it was bought elsewhere. Insurance is free and in early access.
How does the Agency plan scale?
The plan is $499/mo with 1,000 Azure mailboxes included, and each one after that is $0.50/mo. Paying yearly gives you two months free.
Can I bring the mailboxes my clients already have?
Yes. Mailboxes bought anywhere else connect for free. You only pay for what you provision through sending.ac.
Start sending today.
Mailboxes, domains and DNS in one order, live the same day. Bring the sequencer you already run.
- 1,000 Azure mailboxes included
- $0.50/mo for each mailbox after that
- Around 4,000 outreach emails a day
- A workspace per client, one agency view
- Mailbox insurance, free in early access
- Two months free when you pay yearly