Sender domain rotation planner: which domains send on which day
In short: Enter your domains, mailboxes per domain, emails per mailbox, daily target and the days a domain sends and rests. The planner staggers the pool, lists the active domains for each day, flags days short of your target and gives the domains needed. Limit: It schedules the pattern you type; it does not say what volumes or rest periods are safe.
A rotation plan staggers sending domains so some rest while others send. Type your domains, mailboxes, the emails per mailbox you have chosen, your daily target and a send-and-rest pattern. The planner lists the active domains each day, the capacity, any shortfall, and the number of domains needed to hit the target every day.
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The numbers below are examples. Replace them with your own pool, your own per-mailbox number and the rest pattern you want to try.
The number you have chosen, not a recommendation.
0 means no rest.
- Domains sending each day
- 4 to 5
- Days short of your target
- 0
- Average emails per day
- 200
- Domains needed to hit the target every day
- 6
Each domain sends 5 days, then rests 2, a 7-day cycle, staggered so the pool stays level. Every day reaches 200 emails.
1
- Domains sending
- 5
- Which
- 1, 2, 3, 4, 5
- Capacity
- 300
- Planned
- 200
- Short by
- 0
2
- Domains sending
- 4
- Which
- 1, 2, 3, 4
- Capacity
- 240
- Planned
- 200
- Short by
- 0
3
- Domains sending
- 4
- Which
- 1, 2, 3, 6
- Capacity
- 240
- Planned
- 200
- Short by
- 0
4
- Domains sending
- 4
- Which
- 1, 2, 5, 6
- Capacity
- 240
- Planned
- 200
- Short by
- 0
5
- Domains sending
- 4
- Which
- 1, 4, 5, 6
- Capacity
- 240
- Planned
- 200
- Short by
- 0
6
- Domains sending
- 4
- Which
- 3, 4, 5, 6
- Capacity
- 240
- Planned
- 200
- Short by
- 0
7
- Domains sending
- 5
- Which
- 2, 3, 4, 5, 6
- Capacity
- 300
- Planned
- 200
- Short by
- 0
8
- Domains sending
- 5
- Which
- 1, 2, 3, 4, 5
- Capacity
- 300
- Planned
- 200
- Short by
- 0
9
- Domains sending
- 4
- Which
- 1, 2, 3, 4
- Capacity
- 240
- Planned
- 200
- Short by
- 0
10
- Domains sending
- 4
- Which
- 1, 2, 3, 6
- Capacity
- 240
- Planned
- 200
- Short by
- 0
11
- Domains sending
- 4
- Which
- 1, 2, 5, 6
- Capacity
- 240
- Planned
- 200
- Short by
- 0
12
- Domains sending
- 4
- Which
- 1, 4, 5, 6
- Capacity
- 240
- Planned
- 200
- Short by
- 0
13
- Domains sending
- 4
- Which
- 3, 4, 5, 6
- Capacity
- 240
- Planned
- 200
- Short by
- 0
14
- Domains sending
- 5
- Which
- 2, 3, 4, 5, 6
- Capacity
- 300
- Planned
- 200
- Short by
- 0
| Day | Domains sending | Which | Capacity | Planned | Short by |
|---|---|---|---|---|---|
| 1 | 5 | 1, 2, 3, 4, 5 | 300 | 200 | 0 |
| 2 | 4 | 1, 2, 3, 4 | 240 | 200 | 0 |
| 3 | 4 | 1, 2, 3, 6 | 240 | 200 | 0 |
| 4 | 4 | 1, 2, 5, 6 | 240 | 200 | 0 |
| 5 | 4 | 1, 4, 5, 6 | 240 | 200 | 0 |
| 6 | 4 | 3, 4, 5, 6 | 240 | 200 | 0 |
| 7 | 5 | 2, 3, 4, 5, 6 | 300 | 200 | 0 |
| 8 | 5 | 1, 2, 3, 4, 5 | 300 | 200 | 0 |
| 9 | 4 | 1, 2, 3, 4 | 240 | 200 | 0 |
| 10 | 4 | 1, 2, 3, 6 | 240 | 200 | 0 |
| 11 | 4 | 1, 2, 5, 6 | 240 | 200 | 0 |
| 12 | 4 | 1, 4, 5, 6 | 240 | 200 | 0 |
| 13 | 4 | 3, 4, 5, 6 | 240 | 200 | 0 |
| 14 | 5 | 2, 3, 4, 5, 6 | 300 | 200 | 0 |
Capacity = active domains x mailboxes x emails per mailbox. The planner only spreads the numbers you type; whether a domain can safely send that volume is for you and your provider to judge.
Sample result
In the example, 6 domains on a 5-send, 2-rest pattern reach 200 emails every day.
- Domains needed
- 6
- Active per day
- 4 to 5
- Days short
- 0
What this means for you
Four or five domains send each day, and 6 is the fewest that covers the target on the weakest day.
- Your send and rest days
- Active domains per day
- Shortfall flagged
- Download the plan
- Domains
- Rotation
- Planner
By SimpleVerifier Team · Last updated · Runs in your browser; nothing you paste is sent to us
Keep every active domain sending to real addresses.
- Export the leads the rotation will send to, one address per row.
- Upload or paste it at /verify. Every address gets a live mailbox check, and the first 100 email checks are free with a Google sign-in, no card.
How do I plan a sending domain rotation?
- Type how many sending domains and mailboxes per domain you have.
- Type the emails per mailbox on an active day, using the number you have chosen yourself.
- Type your daily target, the days in a row a domain sends and the rest days after.
- Read which domains send each day, the days that fall short and the domains needed.
- Download the plan and follow it in your sequencer.
Example
- You enter
- Example: 6 domains, 2 mailboxes each, 30 emails per mailbox, a target of 200 a day, 5 send days then 2 rest days.
- You get
- A 7-day cycle with 4 or 5 domains sending each day. Every day reaches 200 emails, and 6 domains is the fewest that does so on every day. Day 1 uses domains 1 to 5.
- Limits
- Runs in your browser; nothing is uploaded. Every number is typed by you; the values here are examples.
How does the rotation work?
Each domain follows the same cycle: the send days you typed, then the rest days. Domain 1 starts the cycle on day 1, domain 2 a day later in the cycle, and so on, wrapping around, so the pool is spread across the cycle instead of all domains resting on the same days. Capacity on a day is the active domains times mailboxes times emails per mailbox, and the planned number is your target or the capacity, whichever is lower.
How many domains do I need?
The planner tries pools of 1 up to 1,000 domains with your pattern and reports the smallest one that covers your target on its weakest day. With a short cycle and few domains the active count can differ from day to day, so the minimum, not the average, decides. Reducing the rest days or raising the emails per mailbox lowers the number needed; whether that suits your sending is your decision. The cold email volume calculator works from published mailbox limits.
What does the planner not decide?
It does not say how many emails a domain or mailbox can safely send, how long a domain should rest, or whether resting helps. Those depend on your provider and your results, so every number is yours. It only turns your pattern into a day-by-day schedule. Before any domain sends, set up its records; the cold email DNS records generator covers that.
Who uses this tool, and for what?
- Cold emailers
- Lay out a send-and-rest schedule across a pool of domains before setting it in a sequencer.
- Agencies
- Show a client how many domains a daily volume needs under a given pattern.
- Deliverability consultants
- Test a rotation idea against a target volume before changing a client's setup.
What can’t this tool tell you?
- It schedules the pattern you type; it does not say what volumes or rest periods are safe.
- It assumes every domain has the same mailboxes and the same per-mailbox number.
- Planned volume is split evenly across the active domains.
- It does not model warm-up, which is a separate plan.
Common questions
- Does resting a domain improve deliverability?
- The planner makes no claim either way. It schedules the pattern you choose.
- What should the emails per mailbox be?
- Whatever you have decided on, within your provider's limits. The planner does not suggest a number.
- Why do the active domains change from day to day?
- When the pool does not divide evenly into the cycle, a few more or fewer domains are active on some days.
- What if I do not want rest days?
- Set rest days to 0 and every domain sends every day.
- Does it connect to my sequencer?
- No. It produces a plan and a CSV you apply yourself.
- Is anything uploaded?
- No. The numbers stay in your browser.
A tidy list can still be full of dead addresses.
Extracting, deduplicating and syntax checks all work on the text of an address. None of them can tell whether the mailbox exists. Only the server that hosts it can answer that, through an SMTP check, and that is what the paid product does.
- Upload the cleaned file as it is: CSVs up to 100,000 rows
- A real SMTP mailbox check on every row, with catch-all detection
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