I just switched from the regular Apple Mail app, which I had been using daily since 2008, to Thunderbird. I had been having problems with Apple Mail's program's "message tagging" feature, which I used for marking which emails I had to respond to. This feature became a daily nuisance, and after repeatedly calling Apple's tech support and jumping through all sorts of hoops, I finally decided to try Thunderbird. What a breath of fresh air! And yes, Thunderbird is Open Source software.
I've got the following Thunderbird plugins / extensions installed:
I also disabled the "Lightning" plugin because I don't want to use Thunderbird for managing my calendar. For this, I'll continue using Google Calendar (via Apple's Calendar.app).
We've been hosting clients' web sites and email on our server for the last few years - and one of the most common areas of confusion, questions, and support has been with the configuration and usage of the email system. Since the email system frequently yields responses such as "I didn't know it could do that," I figured that I would put together this video tutorial that addresses uses, tips for setting up an email client (Outlook), and common issues.
Register for an account here:
View the tutorial here: