Hi Simon,
For your use case, blocking registration by email domain on the registration path is great when you want to broadly prevent entire domains from registering, and it stops them right at the email step.\
Exclusion List contact groups, on the other hand, are better when you need to block specific people across one or many events, regardless of which email address or domain they use. They're reusable across events and can show a tailored message, but they do require you to maintain those contacts in a group and attach that group to your event's Security settings.
Many clients end up using both: domain blocking for broad patterns and Exclusion Lists for known individuals they never want to register.
Thanks,
Julianna
------------------------------
Julianna Hampshire
Lead Customer Success Advisor
SalesforceGenericAccountUnited States
------------------------------
Original Message:
Sent: 02-19-2026 08:34
From: Simon Gerzina
Subject: Adding Exclusion Lists
Hi Julianna!
We have been setting registration exclusion lists via the Registration Paths, using the "Limit Registration by" > "Blocking the following email domains" settings, then adding a CSV domain list.
Can you let me know if there are advantages or disadvantages to that approach? I hadn't considered the Contact Group approach until you mentioned it here.
------------------------------
Simon Gerzina
Sr. Manager
AkamaiUnited States
------------------------------
Original Message:
Sent: 02-16-2026 10:17
From: Julianna Hampshire
Subject: Adding Exclusion Lists
Hi Beth,
For events that aren't open to everyone, you can prevent specific contacts from registering by using an Exclusion List:
First, create a Contact Group with Type = Exclusion List in your Address Book and add the contacts you want to block.
Then, open the specific event and go to General > Event Settings > Security > Edit.
Under Exclusion Lists, select that Exclusion List contact group and save.
Once this is set up, anyone in that group will be blocked from registering for that event.
Hope this helps!
Julianna
------------------------------
Julianna Hampshire
Lead Customer Success Advisor
SalesforceGenericAccountUnited States