In order to regularly notify my customers about new promotions, and in general to send promotional mailings to my customer base, I need to find good software. Can you recommend me any options that you have used yourself and that you like?
As for the software for sending Email, I would recommend that you familiarize yourself with this resource https://apiway.ai/categories/email-marketing . There are email marketing software for all tastes, and you can find something based on your requests. At the very least, you won't have the same problems as in Spark.