If you’re using MailChimp, you need to take Paul Jarvis’s course Chimp Essentials. It paid for itself within a few months and has since saved me even more money and time.
I’m not an affiliate. I’m not being paid to say this. It’s just a really good course (that should have been bought by MailChimp long ago and provided to all new customers).
Check out the rest of this month’s posts on creating email newsletters.