JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Unfortunately, custom sender name is available with notifiers but with Autoresponders. However, as a workaround you may consider adding a hidden field on the JotForm with your custom sender name as default value.
Then you can select this field in the notification settings.
Hope this information helps. Please let us know if you need any further assistance. We will be happy to help.