As per Mailchimp alternatives. What would you recommend? I found these so far and leaning towards moving to Mailjet.

https://www.mailjet.com/

https://www.sendinblue.com/

https://constantcontact.com/

...what am I missing?

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The email from mailchimp:

Hello,

Mailchimp does much more than email—we’re now an all-in-one Marketing Platform that’s designed to give small businesses the tools they need to grow.

With these additional features, we have a new way of calculating the number of contacts in your audience. This will require you to make a change in your account before August 7, 2019, to avoid a disruption in service. Please continue reading to learn more about what you need to do.

What’s changed When we were an email-only company, your audience was made up of contacts who were subscribed. However, we now offer features that go beyond email. So, while you can't send emails to your non-subscribed or unsubscribed contacts, you may still be able to engage them through other touchpoints, like ads or postcards.

Since non-subscribed and unsubscribed contacts have value, they’re now included as contacts in your audience. As a customer on a free plan, you’re allowed up to 2,000 total contacts in your audience. As of July 22, your account has 1,890 subscribed contacts, 0 non-subscribed contacts, and 1,165 unsubscribed contacts for a total of 3,055 contacts in your audience.

Since your account is above the 2,000 contact maximum for our free plan, you’ll either need to upgrade to a paid plan or archive some of your contacts to remain on the free plan.