Suppression Formats Reference

Format Types

Format Details

Email

• The most common suppression format.
• Accepts plain text email addresses, one per line or row.
• Exact match only — user@example.com suppresses only that specific address.
• Use for: unsubscribe lists, hard bounce lists, complaint lists.

Pattern

• Uses wildcard (*) characters to match portions of email addresses.
• *bot* matches any address containing "bot" (e.g., robot@example.com, bot123@domain.com).
• spam* matches any address starting with "spam" (e.g., spamtrap@example.com).
• *@tempdomain.com matches any address at that domain.
• Use for: blocking categories of known-bad addresses, role accounts, bot patterns.

MD5

• Accepts MD5-hashed versions of email addresses.
• Hash must be lowercase hex (32 characters).
• EmailElement hashes each contact's email and compares against the list.
• Use for: receiving suppression data from partners or third parties without exposing raw emails.

SHA512

• Accepts SHA-512-hashed versions of email addresses.
• Hash must be lowercase hex (128 characters).
• EmailElement hashes each contact's email using SHA-512 and compares against the list.
• Use for: receiving suppression data from partners or third parties who use SHA-512 hashing for higher security than MD5.

Domain

• Suppresses all email addresses at the specified domain.
• Enter the domain only, without @ (e.g., example.com, not @example.com).
• Use for: blocking competitor domains, known spam trap domains, parked domains.

File Upload

• Supported file types: CSV, Excel (.xlsx, .xls), Text (.txt)
• Multi-column files: supported — map the correct column during upload
• Upload modes:
  • Append — adds new entries to the existing list; existing entries are preserved
  • Repopulate — clears the entire list and replaces with the file contents
• Duplicates: automatically filtered during processing
• Upload history: tracked in the list grid showing records processed, date, and file name

Manual Entry

• Click Add on the suppression list detail view.
• Enter up to 250 items at a time.
• Format must match the list's suppression type.
• Entries are validated on save; invalid formats are rejected.

Global Suppression

• Toggle the Global slider on any suppression list to make it apply to all sends.
• Global lists are checked against every scheduled send across the account.
• Brand-level suppression lists are automatically created with each Brand.
• Both global and brand-level suppressions are reflected in the Suppression Count on segments.