Inbox rotation
Distribute campaign sending across eligible business inboxes.
Create a sending pool, choose round-robin or random allocation among connected, send-ready inboxes, and let MailSequence enforce inbox and domain capacity before a message is sent.
Round-robin or random·Connected and send-ready inboxes only·Explicit daily limits
Sending pools
Define the pool. MailSequence checks who can actually send.
Connect business inboxes
Authorize Google Workspace or Microsoft 365 synchronization and verify SMTP sending, or purchase configured inboxes after domain setup.
Test readiness
An inbox must be connected and have a tested, complete sending configuration before it is eligible.
Select the campaign pool
Choose which workspace inboxes are allowed to carry a particular campaign.
Choose allocation
Use round-robin for fair distribution or random selection for natural variability across eligible senders.
Enforce capacity
Apply the lower of system and user-defined inbox limits while also respecting domain-level capacity.
Pause when none qualify
If the pool is empty or no inbox is active and send-ready, the campaign pauses instead of silently forcing a send.
Allocation choices
Fair distribution or random variability.
Allocation happens only inside the campaign's chosen pool and only among inboxes that pass connection and send-readiness checks.
Round-robin
Advance through eligible inboxes in sequence so campaign assignments are distributed fairly over time.
Random
Choose randomly from the currently eligible pool when the operation prefers less predictable assignment.
Guardrails
Rotation spreads work across healthy inboxes.
A larger pool can distribute campaign volume, but each inbox and domain still needs authentication, warmup, healthy credentials, relevant outreach, and conservative limits.
Inbox limits
Set a user-defined daily cap at or below the system maximum for the mailbox.
Domain limits
Keep total sending across all inboxes below the workspace domain limit.
Warmup capacity
Campaign and warmup activity share mailbox and domain capacity. MailSequence shows their combined effect on readiness.
FAQ
Frequently asked questions
What is a sending pool?
It is the campaign-specific list of inboxes MailSequence may use for contact enrollment and sending. Only inboxes in the same workspace that are connected and send-ready qualify.
How does round-robin allocation work?
MailSequence advances through the currently eligible inboxes in the pool using the campaign's last allocation position, distributing assignments fairly over time.
Can I use random allocation?
Yes. A campaign can choose random allocation instead of round-robin, and the choice still applies only to currently eligible inboxes.
What happens if every inbox is unavailable?
The campaign pauses when its pool is empty or no selected inbox passes the active connection and send-readiness checks.
Does rotation bypass provider sending limits?
No. MailSequence enforces mailbox and domain capacity. Provider policies, mailbox history, domain reputation, and recipient behavior still apply.
How many inboxes can I rotate?
The plan determines total inbox capacity: 5 on Starter, 10 on Growth, 50 on Scale, and 200 on Enterprise. Per-domain limits also apply.
Build a sending pool that pauses when no inbox is ready.
Connect authenticated business inboxes, set limits, and choose the allocation strategy for the first campaign.