Most Mailchimp users are running one RSS feed into one automated campaign. It works, up to a point. But the moment your content spans more than one source - a blog, a news feed, an events calendar, a jobs board - that single-feed setup starts to show its limits. You end up either picking one source and ignoring the others, or rebuilding the campaign manually every time you want to mix things up.
Mailchimp’s native RSS campaign accepts one feed URL. To use several sources in one campaign, you therefore need to combine them before Mailchimp reads them. A simple merged feed can send the same combination to everyone; FlipRSS can additionally match feeds to Mailchimp subscriber groups.
This guide owns the Mailchimp-specific setup. If you have not yet planned your sources, limits, duplicate handling and audience rules, start with the platform-neutral multi-feed automation planning guide.
Multiple RSS feeds in Mailchimp: what’s actually possible
There are two workable approaches:
- Merge several feeds into one URL. Mailchimp reads the merged URL as a standard feed and every recipient receives the same content.
- Use a multi-feed personalisation layer. FlipRSS combines the sources, maps them to Mailchimp groups and supplies the content required by the campaign.
Mailchimp itself remains responsible for the audience, email template and delivery. The combining and filtering happen before the campaign content is assembled.
Why one feed is rarely enough
The standard Mailchimp RSS campaign assumes your content comes from one place. For a simple blog, that’s fine. But most organisations publishing newsletters are working with more than one content stream.
A university might want to combine departmental news, upcoming events, and research publications. A non-profit might need to pull from their blog, their campaign updates, and their volunteer opportunities. A publisher might be aggregating content from several verticals into one weekly digest.
With a single RSS feed, you’re forced to make a choice: centralise everything into one feed before it reaches Mailchimp (cumbersome), or build separate campaigns for each content type (expensive and hard to manage). Neither is a good answer.
The real solution is handling the aggregation at the newsletter layer - pulling multiple feeds together and letting subscribers receive the combination that’s relevant to them.
How Mailchimp handles multiple RSS feeds natively
Mailchimp’s built-in RSS campaign functionality supports one feed URL per campaign. That’s the documented limit, and it’s where most users stop.
That limitation can be handled in two ways.
The first is feed merging - combining multiple RSS feeds into a single URL before they reach Mailchimp. Several tools can do this, producing one feed that contains content from multiple sources. Mailchimp then treats it as a single feed, with no awareness that it’s actually aggregated.
The second is using a platform specifically designed to handle multi-feed RSS campaigns in Mailchimp - one that sits between your feeds and Mailchimp, manages the aggregation, and adds the ability to match different content to different subscriber segments. This is what FlipRSS does, and it’s the approach that unlocks personalisation alongside aggregation.
Both approaches solve the “multiple sources” problem. Only the second also solves the “right content for the right subscriber” problem.
The Feed → Filter → Personalised email model
Before getting into setup, it helps to understand the underlying logic. Every effective multi-feed newsletter works in three stages.
Feeds are your content sources - the RSS URLs from your blog, your events calendar, your news section, your jobs board, any external sources you want to include. These are the raw ingredients.
Filtering is where you decide which content goes to which subscriber. Without filtering, aggregating multiple feeds just produces a longer, noisier newsletter. With filtering - based on subscriber preferences, Mailchimp groups, or content categories - each subscriber gets the combination that’s relevant to them.
Personalised email is the output: a campaign that looks hand-built but assembled itself. Different subscribers receive different content from the same campaign, without you touching it.
The power of multi-feed RSS isn’t just the aggregation. It’s that aggregation makes personalisation possible at scale.
Setting up multiple RSS feeds in Mailchimp with FlipRSS
Here’s the practical setup process.
Step 1: Identify your content sources
List every RSS feed you want to include in your newsletter. Most content management systems generate RSS feeds automatically - WordPress, Ghost, Squarespace, and most news platforms all produce standard RSS URLs. If you’re unsure whether a site has an RSS feed, add /feed or /rss to the URL and see what appears.
Collect all the feed URLs before you start. A typical setup might have three to six sources.
Step 2: Connect your feeds in FlipRSS
In FlipRSS, add each feed URL individually and assign it a clear category label. These labels are used by the filtering rules later - a subscriber who has indicated interest in “Events” can receive items from the events feed; one who has selected “Research” can receive items from the research feed.
You can also set display rules for each feed: how many items to show, how to order them, whether to include images, and how to handle items that have already appeared in a previous campaign.
Step 3: Connect FlipRSS to your Mailchimp account
Connect FlipRSS to the Mailchimp account used for the newsletter. Once authorised, select the relevant Mailchimp audience and groups for the campaign. Treat API credentials as sensitive and use the access method provided by the product rather than sharing credentials by email or document.
Step 4: Map feeds to Mailchimp subscriber groups
This is the personalisation step. If you’re already using Mailchimp’s Groups feature to segment your list by interest, FlipRSS maps each feed to one or more groups. A subscriber in the “Donors” group receives content from your fundraising and impact feeds. A subscriber in the “Volunteers” group receives content from your volunteering and events feeds.
If you haven’t set up Mailchimp Groups yet, FlipRSS can still work without segmentation - all subscribers receive all feeds - but you lose the personalisation benefit.
Step 5: Set up the automated Mailchimp campaign
In Mailchimp, you create an RSS campaign as normal, but instead of pointing it at one of your own feeds, you point it at the FlipRSS feed URL for your campaign. FlipRSS dynamically generates personalised feed content for each subscriber segment, and Mailchimp assembles and sends the campaign on schedule.
From Mailchimp’s perspective, it’s a standard RSS campaign. The intelligence is in what FlipRSS is serving to each subscriber.
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What multi-feed RSS actually changes
The operational benefit is obvious: one automated campaign replaces several manual ones, or replaces the compromise of sending everyone the same thing.
The subscriber benefit is more significant. Newsletters that feel relevant get opened. Newsletters that consistently send content a subscriber doesn’t care about get ignored - and eventually unsubscribed from. Every irrelevant item in a newsletter is a small tax on subscriber trust.
The benefits can extend beyond production time. In the Auburn University case study, preference-matched newsletters were associated with a 45% increase in open rates and a 60% increase in click-through rates. Results will vary, but the example shows why relevance should be designed into the workflow rather than treated as an afterthought.
The feeds you can combine
Any valid RSS feed can be included. Common combinations we see:
A blog feed and an events feed - useful for organisations that want to keep subscribers informed of both editorial content and upcoming activities without running two separate campaigns.
Multiple blog feeds from different departments or verticals - useful for universities, associations, and media organisations with several content areas feeding one newsletter.
Internal feeds and curated external feeds - some organisations supplement their own content with relevant external sources, pulling in industry news or partner content alongside their own.
Product or jobs feeds alongside editorial content - relevant for organisations where subscriber interest spans both content and opportunity.
The constraint is simply that each source needs a valid RSS URL. If it doesn’t have one natively, an RSS generation tool can usually create one.
Common setup mistakes
For a deeper diagnostic checklist, see seven Mailchimp RSS campaign mistakes and how to prevent them.
A few things to watch for when setting up multi-feed campaigns.
Overlapping content between feeds is the most common issue. If two of your feeds occasionally contain the same article, it will appear twice. FlipRSS has post deduplication built into the Enterprise tier - on other tiers, it’s worth auditing your feeds for overlap before launching.
Feed update frequency mismatches can produce uneven newsletters. If one feed updates daily and another updates monthly, the daily feed will dominate. Setting display limits per feed solves this - you might show a maximum of three items from the high-frequency feed regardless of how many are available.
Missing subscriber preference data limits personalisation. If your Mailchimp list doesn’t have groups set up, or if subscribers haven’t been asked to express preferences, the filtering step can’t do much. Adding a preference centre - a simple page where subscribers can choose what they want to receive - is worth the one-time setup investment.
What to do next
If you’re already running a Mailchimp RSS campaign with a single feed, the upgrade path is straightforward. You don’t change your Mailchimp setup. You connect FlipRSS, add your additional feeds, configure the preference mapping, and point your existing campaign at the new feed URL. Existing subscribers and campaign settings stay intact.
If you’re starting from scratch, first validate the feeds and define the Mailchimp group mapping. The amount of setup depends on the number and quality of the feeds, the existing audience structure and the complexity of the preference rules.
If subscribers need different content combinations, plan the preference model before building the template. Our guide to newsletter personalisation in Mailchimp compares Groups, conditional content and preference-matched RSS delivery.
The gap between a single-feed newsletter and a properly configured multi-feed, preference-matched campaign is larger than most people expect. It’s not just more content sources. It’s a fundamentally different relationship with your subscribers - one where the newsletter earns its place in the inbox every time it arrives.
How can FlipRSS help you?
FlipRSS saves content creators and publishers time by fully automating email newsletters whilst delivering content personalised to individual subscriber preferences.
FlipRSS integrates with Mailchimp to automate multiple RSS feeds in email newsletters. Using advanced segmentation, FlipRSS enables your subscribers to select the content they wish to receive, enabling the automated delivery of personalised content. FlipRSS clients are seeing immediate increases in open rate, click-through rate, and subscriber satisfaction.
Once set up, newsletters are created, customised and scheduled automatically.
What sets us apart?
We’re a small team. Small enough to really care. We care about the quality of the product we produce, we care about the experience of every customer we have the privilege of working with, and we care about our impact. We’re here to do a great job of supporting, delighting and connecting you and your subscribers.