Is there a newsletter service that allows me to use multiple separate RSS feeds to combine the content of my newsletter? I've found services that let me combine these feeds as one feed but I want them to be separate because I need to place the content of the feeds to different locations in the layout. If this is not possible is there a newsletter service that let's me include an external HTML page inside a newsletter? With this solution I could generate the HTML content elsewhere and then just simply fetch the HTML content automatically. This needs to be automated because newsletters are sent twice a day to thousands of users.
You can use multiple separate RSS feeds in MailChimp by using FEED merge tag http://kb.mailchimp.com/article/how-can-i-add-any-blog-post-to-a-regular-campaign.