Site Catalyst has been implemented and our website offers newsletters to subscribers.
However, I want to know how many people clicked & opened the email .Awaiting Reply !
Welcome to the Analytics Community!
Can you tell me which client are you using to send the emails? If your email client supports HTML you could use the way outlined in this article - https://helpx.adobe.com/analytics/kb/sending-image-requests-emails.html
I hope this helps.