How to turn yr list into fans:
https://my.wealthyaffiliate.com/training/turn-your-list-into-fans/building-an-optin-list
Free Pop-Up Email Subscribe Optin:
https://my.wealthyaffiliate.com/training/free-pop-up-email-subscribe-optin/why-email-marketing-works
Email Opt-In With Sumome:
https://my.wealthyaffiliate.com/training/free-combo-sharing-email-opt-in-sumome/why-sumome
Free-Combo-Sharing - Email Op-in with Sumome
https://my.wealthyaffiliate.com/training/free-combo-sharing-email-opt-in-sumome
Email Markeitng with Icegram and Rainmaker:
https://my.wealthyaffiliate.com/training/boost-your-email-marketing-with-these-two-free-plugins
Grow subscribers with traffic :
https://my.wealthyaffiliate.com/training/analyse-grow-subscribers-and-traffic-with-1-simple-plugin
Aweber- List Building :
Aweber email to sidebar:
https://my.wealthyaffiliate.com/training/how-to-add-an-aweber-email-subscribe-form-to-your-sidebar
Aweber popup form website:
https://my.wealthyaffiliate.com/training/how-to-add-an-aweber-popup-form-to-your-website
One comment about transactional emails having a high open rate is that it is not surprising, but expected. Because transactional emails are in response to a transaction. For example, confirmation of a purchase or notice of shipment. Or even account info in response to a lost password.