The first reason could be the post launch ramp-up. Once first launched, we start at 2/day and gradually increase over a 10 day period to 22/day per inbox where it will cap out at.
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We do this for deliverability reasons and making sure you’re landing in the inbox.

Read this for more clarity:
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Once the campaign comes close to completion (65%+) the emails that trickle out will naturally become more spaced apart as no new leads are being hit, only follow-ups.
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To combat this, create a new campaign:
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