With 21.1% of email marketers, there was no specific pattern in the increment in the warm-up phase.
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Publication Title: State of Email Marketing 2022 Report

Source Link:
https://drive.google.com/file/d/1fCQQo6zLL6Op15pWb9nVvTOAuDSrbsEs/view?usp=sharing

Publication Year: 2022