My newsletter Le Courrier du hacker (3,800 subscribers, 176 issues) is 3 years old and Mailchimp costs were becoming unbearable for a small project ($50 a month, $600 a year), with still limited revenues nowadays. Switching to the Open Source Mailtrain plugged to the AWS Simple Email Service (SES) will dramatically reduce the associated costs. …
Yes, and no.
Imagine subscribing to an RSS feed for something like password reset, order confirmation etc.
But for marketing stuff: Totally.
I don’t know anyone using email services for password resets. Emails for communication of one transaction is fine. The repetitive dispensing of random information by email is not.