A suppression list is used to block specific email addresses from receiving your campaigns. This ensures you don’t send to people who have opted out, need to be excluded, or must not be contacted for compliance reasons.
Why Use a Suppression List?
Suppression lists let you:
Exclude specific contacts from a campaign or list.
Prevent sending to certain domains or addresses.
Maintain compliance and protect deliverability.
Example: If you have 20 email addresses you don’t want to email, you can add them to a suppression list. During campaign setup, select that suppression list. The system will cross-reference your mailing list and automatically exclude those addresses.
What is MD5 Hash?
Some suppression lists may use MD5 hash encryption.
Selecting MD5 hash during upload will decrypt the file and match only the addresses that appear on your list.
This is simply an added security method for encrypted suppression files.
File Upload & Size Limitations
FTP upload is not available.
You can upload suppression files in ZIP archive format.
Maximum file size: 410 MB.
How to Create a Suppression List
Prepare a file containing the email addresses you want to suppress.
Can be plain text or zipped.
Each line should contain one email address.
Go to Contacts → Suppression in your Emercury panel.
Click New List.
Upload your file.
During campaign setup, select the suppression list you want to apply.
How It Works in Campaigns
When you launch a campaign:
Emercury automatically compares your selected mailing list with the suppression list.
Anyone on the suppression file will not receive the campaign.
Everyone else will be mailed as normal.
For step-by-step instructions, please check our instructions video below: