When emails are sent using a new platform, Internet service providers (ISPs) are suspicious of IP addresses that are not recognized. If large volumes of emails are suddenly sent, the ISPs often mark them as spam.
To avoid being marked as spam, you can progressively increase the volume sent by distributing large volumes of emails over different times. This should ensure smooth development of the start-up phase and enable you to reduce the overall rate of invalid addresses.
For example, you can segment your target audience randomly to send your delivery in five batches. You will send a first batch representing 10% of your target audience on June 1st at 10:00 AM, a second batch 24 hours later with 15% of the audience, and so on.

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Access the marketing activity list and create a new workflow. See Creating a workflow.
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Drag and drop a Query activity into your workflow and open it. See the Query section.
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Drag and drop a Segmentation activity into your workflow and open it. See the Segmentation section.
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Drag and drop an Email delivery activity into your workflow and open it. See the Email delivery section.
Note:
Make sure that all dates are in the future when confirming the send. Otherwise the message will be sent as soon as the send is confirmed.
Send time optimization is also useful for campaigns involving a call center. You can ensure that all messages are not received at the same time. This enables your organization to process the number of calls according to its capacity.
For example, you want to send an email inviting your customers to contact a call center in order to get a promotional offer. To avoid overwhelming the call center, you decide to segment your target audience randomly to send your email in four batches.

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Access the marketing activity list and create a new workflow. See Creating a workflow.
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Drag and drop a Query activity into your workflow and open it. See the Query section.
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Drag and drop a Segmentation activity into your workflow and open it. See the Segmentation section.
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Note:
The contact date will be defined in the Email delivery activity later in the workflow.
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Drag and drop an Email delivery activity into your workflow and open it. See the Email delivery section.
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In the Expression editor , set the date and the segment codes to compute the data for each customer.
In the list of functions, select ToInteger . In the available fields, select Additional data > Segment code .
AddHours([currentDelivery/scheduling/@contactDate], ToInteger([targetData/@segmentCode]))