Email throttling

Email throttling adds a pause between each email of a campaign. Sending 500 emails in a minute looks like a bulk blast to mailbox providers; sending them a few minutes apart looks like a person at work. Throttling draws less attention and keeps your account in good standing.

How it works

With a 10-minute delay, a campaign of 6 emails takes an hour. The delay applies to every campaign you start after changing it, and runs in the background: you can close the spreadsheet and the browser.

The sending type of each campaign is visible in Campaigns: BLAST for no delay, DELAY for a throttled campaign.

Set the delay

Open Settings, from the sidebar or via Extensions → Mail Merge for Gmail → ⚙️ Settings. The Sending speed card (the deliverability control of your account) offers three choices:

• As fast as possible: no delay beyond what Gmail itself imposes.
• Delay between emails: a fixed pause of 1 to 60 minutes.
• Random delay: a random pause between each email, within a range of 0 to 60 minutes. The most natural-looking pattern.

Changes save on their own.

Throttling an Autopilot campaign

Autopilot campaigns have their own setting: untick Send as a blast in the Autopilot dialog and set the minutes between emails for that campaign. The account-wide speed does not apply to them.

Caution

A long delay on a large campaign takes a long time. 300 emails 10 minutes apart take 50 hours; the campaign keeps going, but your daily sending limit still applies each day. If you set a delay that is too long by mistake, stop the campaign or lower the delay for the next one.

Note

Deliverability control is a premium feature. On the free plan every campaign sends as fast as possible. See Pricing & subscription.

For a slow, steady ramp of a brand-new address, see Email warm-up.