They're in the commodity e-mail delivery service too -- Mandrill -- in addition to MailChimp. Pretty smart to reuse the hardware, staff and ISP/RBL relationships they established with MailChimp to also serve the SMTP-as-a-service market.
I use both. I have sendmail on my servers set to route everything through Mandrill, so my apps don't need to be aware of what software/service I choose for e-mail delivery. I send newsletters/product announcement type mails with MailChimp for the design templates and subscription management.
I use both. I have sendmail on my servers set to route everything through Mandrill, so my apps don't need to be aware of what software/service I choose for e-mail delivery. I send newsletters/product announcement type mails with MailChimp for the design templates and subscription management.