What I really mean is that apart from the standard signup/signin and newsletter emails, how can I send other emails?
For e.g. If a subscriber is not opening my emails, how can I trigger an email to recheck his/her interest?
I have free subscribers and I want to send them an email (without having to write a post for this) to consider moving to paid subscription.
Do not really want to use another mail service front end (like mailchimp etc.) to send these mails.