Change the sender and make the subject clear and easy to understand.

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Try changing the sender from a different source than you used to send emails from before,
both to avoid emails being sent to the trash bin because they look like israel whatsapp the same email, and to make your sender more appropriate for a different approach than before.

If you used your company name in the past, use the service name this time.
Also, make the subject line clear and easy to understand so that it doesn't get too cluttered.

Link it to current events or topics that customers might be interested in.
How to write emails that will reawaken dormant customers
When you think about whether or not to read an email you received, wouldn't you be inclined to open it if it was related to current events, a problem you are currently facing, or an interest you?

The same psychology is felt by dormant customers to whom you are sending an email, so the ideal thing to do is to include current events at the time of sending the email and then tether it to a topic that can promote your company's products.

As an actual example, when we were sending out emails encouraging real estate investment, comedian Matsumoto Hitoshi happened to have made a huge profit in a land deal in Shinbashi, Tokyo. When we mentioned this, the response rate from the emails increased dramatically.