This was across 5 experts who send in the scheme of millions of emails for corporations and such.
You can design directly in it, or design via your email marketing program and import the HTML direct. Which for me was the best option... I use the pro version of Mail Styler, drag and drop and I can change each newsletter around. Apparently it's actually good to change the layout slightly for each mail, as many online mail accounts will push them into spam when they see the same thing repeatedly. Learnt something new.
Total cost for my clean, double opted in list of 22,000 emails for newsletters, Upfront $250 - Ongoing $1 per completed batch sent.
I think one batch via mail chimp was going to cost me $160 per batch sent. This was not an efficient means.
I did a search here for it, and nothing... which is why I'm mentioning it here. It seems the experts use this stuff because it keeps the longevity cost down. Even using it with an external SMTP... that only changes my batch processing from $1 to $9 per batch sent... depending on which SMTP company you use. I used https://serversmtp.com to get my list initially cleaned, as Amazon is pretty strict and will boot you for using their service to clean your list with.
Pretty easy to integrate too. Does anyone else use this in boosting readership and such, and just hasn't mentioned it?