You can use the Email Campaigns module in order to test emails. You can import from existing users in Sitefinity and try to send a campaign with these users as subscribers in mailing list.
To add from existing users go to the Email Campaigns -> Mailing Lists
, create a mailing lists and from the Actions Menu choose "Add from existing
". Now you will be able to select from existing users in Sitefinity.
Please let me know if this helps or whether you need further help.
the Telerik team
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