1. What is a Suppression List?
A suppression list (or negative contact register) is a database of email addresses, phone numbers, and company domains that have requested not to receive further commercial communications. Unlike a simple deleted contact, suppressed records must remain in your system to prevent accidental re-import from new research lists.
2. Why is Suppression Mandatory Under Turkish Law?
Under the Commercial Electronic Message Regulations, senders must cease communications to opt-out recipients within 3 business days. Failure to suppress an opted-out contact can lead to administrative complaints and substantial regulatory fines.
3. Setting Up a Suppression List in Excel / Google Sheets
1
Create a Master Suppression File: Maintain an encrypted spreadsheet titled
MBO_Suppression_Master.xlsx containing columns: Domain, Email, Phone, Opt-Out Date, Channel, Reason.
2
Pre-Campaign VLOOKUP / XLOOKUP: Before launching any campaign or importing newly downloaded directory records, run an automatic lookup against the master suppression list.
3
Global CRM Opt-Out Tagging: In tools like HubSpot or Zoho, set a custom boolean property
Do Not Contact - MBO Verified and trigger an automated exclusion workflow.