I like how easy it is to set up new users and send emails to them. It's also very easy to create templates with custom fields. There are some minor bugs with the interface but they're quickly fixed. I highly recommend this software! We've been able to streamline our workflow by using TMail21. We have also saved time in creating custom templates. Our team is more efficient now because we no longer need to spend so much time writing out content for each email. We can easily update our templates and send them out to multiple people at once.