main logo 2

Blog

High-Level Plan to Reduce Subscriber Count in SFMC

Subscriber Count Reduction in SFMC A Proven High Level Action Plan

In Salesforce Marketing Cloud (SFMC), maintaining an optimised subscriber list is crucial for maximizing campaign performance, improving deliverability, and controlling costs. This blog provides a high-level plan to reduce and manage subscriber count effectively, ensuring your marketing efforts remain targeted and compliant.

Why Reducing Subscriber Count in SFMC Matters

Subscriber count impacts your SFMC license costs and the overall quality of your email marketing. Overloaded, inactive, or redundant subscribers dilute engagement metrics and waste resources. A streamlined, clean subscriber list enables: 

  • Better deliverability and engagement
  • Improved personalization and segmentation
  • Reduction in wasted sends and higher ROI
  • Compliance with email regulations

At AgileSpace Digital, we help businesses streamline their SFMC contact database using proven strategies that reduce billable contacts without risking compliance or losing valuable customer relationships. 

Here’s our high-level, actionable plan to clean, optimise, and maintain your subscriber base in SFMC — turning your bloated contact list into a lean, revenue-driving machine.

1. Understand and Audit Your Subscriber Data 

Audit your data by analyzing: 

  • Contact Counts Report in Analytics Builder to confirm the current billable contact count and understand the breakdown – All Contacts, Populations, Synchronized Data Extensions, etc. 

 

Important counts to consider: 

Tab 01
  • Subscriber status: Active, unsubscribed, bounced, or held

  • Engagement level: Open rates, clicks, conversions

  • Data models: Differentiate between Subscribers and Contacts; avoid duplicates through unique Subscriber Keys (preferably unique IDs over email addresses). Analyze subscriber data where subscriber key is equal to email address.

  • High-volume sources – old imports, Salesforce syncs (Contacts, Leads, and Users), populations, and transactional-only contacts.

  • Channels engaged: Email, SMS, push notifications 
01
2. Retention and Deletion Criteria
  • Set clear criteria for which contacts to keep and which to remove. Common criteria include:

     

    • No Email or SMS engagement (no opens/clicks) in the last 12-24 months.

       

    • Bounces, unsubscribes, or held status.

       

    • Contacts with no valid channel—never sent to, or missing email or mobile numbers.

       

    • Contacts only used for one-off/transactional sends.

       

    • Alignment with legal/compliance (GDPR, CAN-SPAM, etc.) and business stakeholders before deleting. 

3. Identify and Remove Unnecessary Contacts
  • Remove inactive/unengaged contacts using the criteria above.

     

  • Delete hard bounces, unsubscribes, and held contacts (these still count toward the limit).

     

  • Review and clean up Synchronized Data Extensions:

     

    • Limit which Salesforce Contacts/Leads/Users are synced using a gating field or filter.

       

    • Formula fields can be added to Salesforce objects to qualify the records needed in Marketing Cloud.

       

    • During the time of sync we can apply a filter (allows one filter condition) that can be applied on Boolean data type fields in Salesforce objects.

       

    • Remove unnecessary or outdated syncs or data sources.

       

  • Query bad subscriber records in SFMC where subscriber key is same as email address.

     

  • Move subscriber status to correct subscriber records to retain (active or unsubscribed).

     

  • Purge test, seed, and duplicate DEs and contacts. 

4. Executing Contact Deletion in SFMC
  • Use Contact Delete feature in Contact Builder to remove contacts from All Contacts and all associated channels.

     

  • Automate the process using Automation Studio for large-scale deletions (e.g., Data Extract + Contact Delete activities).

     

  • Update Contact Deletion settings for Contacts to remain in suppressed status for 2-3  days before permanent deletion to allow a time window to reverse the deletion if needed. (Performed by SF Support)

     

  • Monitor deletion progress or status and contact deletion. 

5. Prevent Re-Addition of Unwanted Contacts
  • Update Salesforce sync filters to prevent deleted contacts from being re-synced.

     

  • Implement data hygiene processes for future imports and integrations. Importantly, to avoid duplication of records with multiple subscriber keys in All Subscriber.

     

  • Educate teams on new criteria for adding contacts to SFMC.

6. Validate and Monitor
  • Re-run the Contact Counts Report to confirm your new count.

     

  • Monitor regularly to ensure you stay under the limit.

     

  • Document your process for compliance and future audits.

     

  • Set up a regular cadence for contacts cleanup to be under the limit.

7. SFMC Contact Number Calculation for Billing

Billable contacts number is determined by the total unique contacts across the account and includes (not just the contacts in All Subscribers). 

  • All records in the All Contacts list in Contact Builder.

  • All subscribers in the Email Studio > All Subscribers list.

  • All records in MobileConnect (SMS), MobilePush, and other channels.

  • All Salesforce Contacts, Leads, and Users synchronized via Marketing Cloud Connect.

  • All records in Populations (or root data extensions) if you use them.

  • Unsubscribed and held contacts are also counted.

  • Contacts are deduplicated by Contact Key, so a contact appearing in multiple places (e.g., Email and Mobile) is only counted once.

8. Additional Measures:
  • Back up data before deletion, in case needed to restore any contacts.

     

  • Communication with stakeholders – marketing, legal, and IT throughout the process.

     

  • Implementing a phased approach, e.g., deleting in batches, starting with the least valuable contacts.

9. Best Practices for Managing Subscribers Counts.

Subscriber Key and Data Extensions 

Use a unique Subscriber Key aligned with your CRM or a unique customer ID (not just email) to avoid duplication and better track customers across multiple channels. This reduces redundant subscriber counts. 

Prefer Data Extensions over simple lists for large subscriber bases to have more flexible data management and segmentation capabilities. 

Avoid using system-generated Subscriber IDs as keys to prevent performance issues 

02
10. Automate Subscriber Maintenance

Create automations in SFMC to manage subscribers counts on required intervals so you can quickly execute the contact reduction. Example.. 

  • Automation to generate DEs for Unnecessary or Bad Contacts and Deletion on required intervals. This will ease the process of contact deletion over time.

  • Automation to delete unengaged subscribers if they are retained in data extension, CRM or external database.

  • Regularly remove unsubscribes and bounced emails but keep them in suppression lists for compliance.

     

11. Monitor, Analyze, and Optimize Continuously
  • Continuously track subscriber health metrics: active vs. inactive rate, unsubscribe reasons, bounce rates.

     

  • Use reporting dashboards to analyze the impact of subscriber reductions on campaign metrics.

     

  • Adjust data retention and cleansing policies accordingly.

At AgileSpace Digital, we understand the complexities of SFMC subscriber management. This strategic approach combines technical best practices with marketing insight to help organizations:

  • Reduce unnecessary subscriber counts

  • Improve campaign relevance and deliverability

  • Control licensing costs

  • Stay compliant with regulations

Our experts guide you through platform configuration, data hygiene routines and best practices to maximize your SFMC investment. 

Recent Posts
AgileSpace Digital
Services
Teams
Resources
Partners
Work
Careers
About Us
whitelogo
Services
Teams
Resources
Partners
Work
Careers
About Us

Privacy Policy      

Linkedin Youtube-square Facebook-square Pinterest-square

© 2025 AgileSpace Digital