In most cases, email campaigns aren’t usually done by the company in question but by a 3rd party. The lists provided by the company may have been generated 10+ days in advance. I agree – there’s no reason why the list can’t be checked for ‘retentions’ with relation to recent unsubscriptions prior to the email run being performed, but in most cases they (large companies at least) still do it in the same way physical direct mail was done, using the same platforms.
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