Mastering Shopify Flow: How to Email Existing Customer Segments (Not Just New Joiners)

Hey there, fellow store owners! At Shopping Cart Mover, we often see businesses grappling with the nuances of e-commerce automation. A common head-scratcher that recently popped up in the Shopify Community forums perfectly illustrates this: how do you effectively send automated emails to customers who are already in a specific segment, not just the new joiners?

This exact dilemma was brought to the community by TiffanyChung. She had a fantastic goal: to create an onboarding email flow for customers who’ve made just one purchase – a brilliant strategy for nurturing new relationships and encouraging repeat business. The idea was a fully automated process where newly added customers would get the onboarding email, and then, after a couple of weeks, those still in the segment would receive a follow-up. The catch? Shopify Flow was only triggering for customers who newly joined the segment, leaving existing members out in the cold. Sound familiar?

Understanding Shopify Flow's Segment Trigger: The Event-Based Design

If you've encountered this, rest assured, it's not a bug; it's by design. As Moeed from the community astutely pointed out, Shopify Flow is inherently an event-based automation tool. This means it springs into action when a specific event occurs – like a customer joining a segment. It doesn't continuously loop through a segment's existing members looking for people to act on. This is a crucial distinction that often trips up even seasoned Shopify users.

So, if you’ve got a segment of 'One-Time Purchasers' and you create a Flow to email them, it'll only send to customers who transition into that segment after your Flow is active. The hundreds (or thousands!) already in there? They get skipped. Addison2 perfectly summarized this frustration, noting, "It only catches customers who join the segment after the flow is turned on, so the people already inside the segment get skipped." This "backfill" problem is what we need to address.

Solutions for Reaching Existing Segment Members (The 'Backfill' Problem)

The good news is, the community offered some solid workarounds, and as migration experts, we can expand on these to provide comprehensive strategies.

Strategy 1: The Hybrid Approach – Shopify Email Campaigns + Flow for New Joiners

This is often the simplest and most direct solution for one-off communications to existing segment members. Moeed’s advice is spot on:

• For Existing Members: Use Shopify Email (or your preferred email marketing app) to send a one-time campaign.
• For New Joiners: Keep your Shopify Flow running for ongoing automation.

How to Implement the Hybrid Approach:

1. Identify Your Segment: Go to your Shopify Admin, navigate to Customers > Segments, and select the segment you wish to target (e.g., "One-Time Purchasers").
2. Create a Shopify Email Campaign:
   • From your Shopify Admin, go to Marketing > Email.
   • Click Create campaign.
   • Choose your email template or start from scratch.
   • In the "To" field, select your specific customer segment as the audience.
   • Craft your email content (e.g., your onboarding email).
   • Review and send the campaign. This will reach all current members of that segment.
3. Set Up Your Shopify Flow:
   • Go to Apps > Shopify Flow.
   • Create a new flow with the trigger "Customer joined segment."
   • Select the same customer segment.
   • Add an action to "Send email" (using Flow Mail or another integrated email app) to deliver your onboarding message.
   • Add delays and subsequent emails as per your desired sequence (e.g., "Wait 2 weeks," then "Send email 2").

This combination ensures that no customer is missed. Existing members get their initial communication, and all future customers joining the segment automatically enter your Flow sequence.

Strategy 2: Leveraging Customer Tags for Enhanced Segment Management

Another powerful method, particularly for more dynamic segment tracking, involves using customer tags. This approach was suggested by `mastroke` and `tim_1` in the forum.

Manual Tagging for Backfill:

For a one-time backfill, similar to the Shopify Email campaign, you can use tags:

1. Export Your Segment: From Customers > Segments, select your segment and export it as a CSV file.
2. Add a Unique Tag: Open the CSV in a spreadsheet editor. Add a new column (or modify an existing one) to include a unique tag for these customers (e.g., onboarding-email-sent-2024).
3. Import Customers: Re-import the modified CSV back into Shopify. Ensure you select "Overwrite existing customers that have the same email or phone number" to update their tags without creating duplicates.
4. Build a Flow with the Tag: Create a Shopify Flow triggered by "Customer tag added" or "Customer updated," with a condition checking for your unique tag. This can then trigger your email sequence. Remember to remove the tag after the first email or after the sequence to avoid re-triggering.

While this involves some manual work, as `mastroke` noted, it provides a robust way to mark and target specific groups.

Automated Tag Management within Flow (for ongoing refinement):

`tim_1` proposed a more advanced concept: using tags to track customer status within segments for more complex, ongoing flows. While this doesn't directly solve the initial "existing members" problem, it's excellent for managing customer journeys:

Flow 1: Customer Enters Segment & Gets Tagged
Trigger: Customer joined segment (e.g., "One-Time Purchasers")
Action: Add customer tag (e.g., "segment-one-time-purchaser")

Flow 2: Email Sequence Based on Tag
Trigger: Customer tag added (e.g., "segment-one-time-purchaser")
Condition: Customer does NOT have tag "onboarding-complete"
Action 1: Send onboarding email 1
Action 2: Wait 2 weeks
Action 3: Send onboarding email 2
Action 4: Add customer tag "onboarding-complete"

This approach gives you granular control over who receives what, based on their current status and segment affiliation, making your automations incredibly precise.

Strategy 3: Advanced Automation with Third-Party Email Marketing Platforms (e.g., Klaviyo)

For merchants seeking truly automated and recurring segment-based flows that include all current members, not just new ones, third-party email marketing platforms like Klaviyo are often the answer. As Moeed rightly suggested, "Klaviyo handles this natively with segment based flows that include all current members, not just new ones. Worth the switch if this isn’t a one off thing."

Platforms like Klaviyo are built for sophisticated customer journey mapping, allowing you to:

• Target Entire Segments: Create flows that automatically enroll all current and future members of a segment.
• Set Recurring Campaigns: Easily send the same email every X days/weeks to anyone still meeting segment criteria.
• Advanced Segmentation: Build highly specific segments based on purchase history, website behavior, email engagement, and more.
• Robust Analytics: Gain deeper insights into campaign performance and customer behavior.

If your marketing strategy demands complex, dynamic, and recurring segment-based communication, investing in a dedicated email marketing platform is a wise move. At Shopping Cart Mover, we frequently assist businesses in migrating their data and setting up integrations with such powerful tools to unlock their full marketing potential.

Putting It All Together: TiffanyChung's Onboarding Flow

Let's revisit TiffanyChung's specific goal: an onboarding email flow for one-time purchasers, with a second follow-up after two weeks, fully automated, and reaching both existing and new members.

1. Initial Backfill: Use Strategy 1 (Shopify Email campaign) or Strategy 2 (Manual Tagging via CSV) to send the first onboarding email to all current "One-Time Purchasers." This ensures no existing customer is missed.
2. Ongoing Automation: Set up a Shopify Flow (as described in Strategy 1, point 3) triggered by "Customer joined segment: One-Time Purchasers." This flow will then send the first onboarding email, wait two weeks, and send the second follow-up email.
3. Refinement (Optional, for complex needs): If you need to ensure customers only receive emails once, or track their progress more precisely, integrate the tagging system from Strategy 2 (Automated Tag Management) into your Flow.

Conclusion

While Shopify Flow is an incredibly powerful tool for event-driven automation, its design around "new joiners" for segment triggers can be a hurdle. However, as demonstrated by the insightful Shopify Community and our expertise at Shopping Cart Mover, there are clear, actionable strategies to overcome this. Whether you opt for a hybrid approach, leverage customer tags, or integrate with advanced third-party platforms, you can ensure your valuable customer segments receive the timely and relevant communications they deserve.

Need help streamlining your Shopify automations or considering a migration to a platform with more robust marketing capabilities? Reach out to Shopping Cart Mover – we're here to help you build an e-commerce ecosystem that truly works for your business.