What are the best practices for using both transactional and marketing email?
Currently I am testing Mailgun for transactional email due to their free API which fits my usage, and once scaled, has balanced pricing plans. This is compared to Mandrill, which recently became a pay-only service. However, Mandrill's parent product - Mailchimp - seems ideal for newsletters, and does have a free version with PAYG payment options which is also balanced for my needs.
The problem is this: I can already create and subscribe clients to lists within Mailgun. However, it appears there is no easy web-interface to send emails in bulk (eg. newsletters). Although I have not yet tried Mailchimp, I hear they do have an interface. This leads me to believe that if I use Mailgun for bulk email, I need to send it through my website server (as an approved domain). In order to do this, I then either need to create a script I can SSH into and call on an email file, or, I need to create an admin page for sending newsletters. This is additional complexity, and I am not sure if this is correct usage, or if there is a better option. Ideally, I wish to combine both transactional and bulk mailing services together, and use a web interface via this service's website for bulk emailing if possible.