Managing which email domains can register helps you enforce access rules depending on if you want to restrict registrations to certain organizations, block known spam domains, or enforce company‑specific signups. By configuring domain-blocking policies and maintaining domain exception lists, you retain full control over who may register while keeping flexibility for exceptions.
How domain blocking works
A global policy determines default behavior: either open (all domains allowed by default) or closed (all domains blocked by default).
Depending on the chosen policy, you manually define exceptions:
Under “open,” you maintain a blocked list of domains that are disallowed.
Under “closed,” you maintain an allowed list of domains that are permitted.
Domains can include wildcards (e.g.
*.example.com) to apply rules to sub‑domains. Use separate entries if you need to block both the root domain and its sub‑domains.
Importing multiple domains in bulk
To import domains en masse:
Navigate to Setup › Registration › Blocked Domains › Actions › Import Domains.
On the Import Blocked Domains page you will see options:
Download blocked domains template
Upload CSV file
Using the template
Click Download Blocked Domains Template. A dialogue box will appear — click OK to save the file.
In the template, fill out for each domain:
Allow — enter
Allowed(to permit) orBlocked(to block)Domain — the domain name (e.g.
example.com), with optional wildcards (e.g.*.example.com)Registration status — for allowed domains only: one of
Default,Confirmed, orUnconfirmed(status assigned when registration occurs via that domain)
If any other columns exist, leave them blank; do not delete any columns.
Save the file as a CSV.
Back on the import page, click Browse, select your saved CSV file, then click Import.
After import, you will see the Blocked Domains Import Summary Report: it shows how many records succeeded and how many failed.
In the Downloads section you can retrieve:
All import rows — full list of processed entries
Error import rows — only the entries that failed, in XLS or CSV format
If there are no errors, the error‑rows link will not appear.
Use the Previous Imports dropdown to review earlier import batches in chronological order.
Configuring global domain‑blocking options
From the Actions dropdown, select Set Block Domain Options.
On the Set Block Domain Options page, populate:
Domain status — choose either
OpenorClosed.Open: by default, all domains are allowed; only domains listed as blocked are disallowed.
Closed: by default, all domains are blocked; only domains listed as allowed are permitted.
Error message: the message (up to 255 characters) that appears for registrants attempting to register with a blocked domain.
Click Save.
With this configured, the system enforces your domain policy across registrations, using the exception lists you maintain.
Adding or editing domains manually
If you need to add an exception manually:
Click Add Domain, or click the Edit icon beside an existing domain entry to modify it.
Fill in the required fields:
Allow / Block: select whether the domain is allowed or blocked.
Domain: enter the domain name (e.g.
example.com), or use a wildcard such as*.example.comfor sub‑domains.If you selected Allow, optionally set a Registration status —
Default,Confirmed, orUnconfirmed.
Click Save.
For wildcard entries: note that *.example.com will apply to sub‑domains only, not the root domain. If you need to cover both, create two entries — one for *.example.com and one for example.com.
Exporting, testing, deleting, or clearing domain lists
Export domains: select Actions → Export Domains to download a CSV file containing all current domain entries and their settings.
Test an email address: choose Actions → Test Email Domain, enter a test email and submit — the system returns whether the domain is allowed or blocked, based on current configuration.
Delete a domain entry: click the delete icon next to a domain and confirm removal.
Clear all domains: select Actions → Clear Domains, then confirm — this removes all domain entries from the exception list.
Using domain-blocking and exception lists gives you robust control over who can register for your event. Whether you block certain domains, whitelist trusted ones, or manage large lists via CSV imports, the system supports flexible configuration. By combining global policy with manual and bulk domain management tools, you can enforce registration rules precisely while adapting to changing needs over time.