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Free tool

Optimal sending delays

Get the optimal sender delay for your target volume and mailbox count — and find out if you need more inboxes.

Free · No signup · Runs in your browser
Delays / inputtargetsfig.
Delays / resultoptimalfig.
14 min
Optimal sender delay
100 emails per mailbox / day
Healthy utilization
10% of the 1000/mailbox safe limit.
Optimal campaign delay14 min
Safe limit / mailbox1,000
Utilization10%
Recommended mailboxes20
Optimization

Human-paced sending wins

01

Spread it out

Delays between sends mimic human behavior and keep you off provider spam radars.

02

Watch utilization

Running each mailbox near its safe limit is efficient — past it, you risk reputation damage.

03

Add inboxes, not risk

When volume exceeds safe limits, the fix is more mailboxes, not harder sending.

FAQ4 entries

Email Delay Optimizer — FAQ

Still curious? Our team responds in under an hour.

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Enough to spread your daily volume evenly across the sending window. The optimizer computes it from your volume and mailbox count.

The share of a mailbox's safe daily limit you're using. High utilization is efficient; over 100% means you need more mailboxes.

If your target volume divided by mailboxes exceeds the safe per-inbox limit, you can't send it safely without adding inboxes.

Yes. Bursts of identical sends look automated. Randomized, human-paced delays consistently improve inbox placement.

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