In February 2023 I changed the service I used for my newsletter from MailChimp to SendInBlue. As a newsletter reader, you shouldn’t notice anything different other than in the ‘small print’ at the bottom of the newsletter.
REMEMBER: Subscriptions are done using a double opt-in system, so after you’ve filled in the subscribe form you get a confirmation email that requires you to click to confirm your subscription. If you don’t get it, do check it’s not stuck in your email spam filter. At the bottom of every newsletter is a link to unsubscribe or change your subscription details.