The secret to online marketing is in the list and mailing list.
In order to become a powerful online marketer you should have only 2 things working for you :
1) product – can be your making, can be affiliate link selling good and reliable product you use yourself.
2) mailing list – subscribe/unsubscribe etc. – This is the power of retail/solo/single and online money flood.
Mailing list is your connection to your potential customers, your paying customers, your gateway to new markets, the way to maintain communication links open with other online marketers as yourself.
What are the open source or nice mailing list programs or scripts?