Throttle the sending of an email campaign

Learn how to use send throttling to control the spread and send rate of a campaign.

Overview

Our system automatically throttles the send of high volume campaigns, in order to protect your sender reputation. This is the default large send speed and will send your messages as soon as possible, limited only by compliance with send volumes imposed by the ISPs managing the inboxes you're delivering to. 

However, you might wish to control and spread this send rate over a longer period than the default send speed allows. This can help protect your email sending reputation with big email providers. Spreading large sends over a period of time will also help ensure your customer service phone lines and resources aren’t swamped should your campaign include a telephone call-to-action.

Before you start

Things you need to know before you use throttled sending:

  • You must send to at least 500 contacts
    Throttled sending only works if your campaign is sent to at least 500 contacts. Otherwise, your campaign is sent immediately, using the default speed.
  • Your campaign report shows data as the send reaches your contacts
    Reporting is available once the campaign is sent and it is updated until the send is complete. For example, you can access any reports over a 24 hour period if you've chosen a spread of 24 hours.
  • Pausing and unpausing a campaign stops throttled sending
    If you're using throttled sending and pause and then unpause a campaign, the chosen time of the spread send no longer applies. This is because the remainder of the unsent emails are sent immediately upon unpausing.

Step 1: Enable send throttling on your account

To turn on send throttling:

  1. Go to Settings > Account > Account settings.
  2. For Features, check the Enable send throttling check box.
  3. Select Save settings.

Step 2: Send a campaign with throttled sending

When choosing your contacts and scheduling your campaign, the throttled sending options appear in step 2.

  1. Under Select when you would like to send the campaign, select Immediately
  2. Select Spread my campaign send over at least. 
  3. Expand the time drop-down menu, and choose a time period to spread the send of your campaign over.

    Choose from 1 hour, 2 hours, 3 hours, 6 hours, 12 hours, or 24 hours. The send is broken down into chunks of 500 emails over the time you choose.

    CP_spread_campaign_send.png

Alternatives to throttled sending

You can use send-time optimisation as a great alternative to throttled sending. Send time optimisation starts sending your campaign immediately but optimises the time of individual sends to maximise open rates based on your contacts' historical opening behaviour. The campaign optimises over a period of 24 hours from the initial time of sending and will remain in the outbox until complete.

Send time optimisation isn't available for a split test or scheduled campaigns.

To learn more, check out the article Use send time optimisation.
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