When sending emails do it from a place of generosity.
How will this benefit the receiver?
As much as you may want to generate sales, bombarding a customer with emails is a poor tactic.
It doesn’t make a person want to read the emails let alone make a purchase but it might lead to them unsubscribing.
There are exceptions to this rule which generally apply to those that aren’t trying to sell anything. Those that make it clear how many emails they intend to send and actually stick with it.
Emails from these kinds of people or brands work well because it feels generous and the intentions are made clear from the start.