By default, Interspire Email Marketer only allows the same email address to be entered once into a contact list so your subscription form will tell people they are already subscribed.
To bypass this, Interspire Email Marketer has a 'Contact Form' feature that will make the subscription form emulate a contact form.
When setting up the website form, there is an option that says:
"Yes, send me an email with a copy of the contact's details" on the first page. Check this option. It will then allow
multiple submissions from the same email address, but will only enter
the user in once to the system.
This way your subscription form will look like and function like a contact form. When someone fills it in, it will send you an email with the details AND add the user to your Interspire Email Marketer contact list.
If you choose this option, then users that are already subscribed to your contact list will still be able to fill in the form, will be sent to a Thank You page but will not be re-added to your contact list.

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