I like that it gives me a quick overview of how my emails are likely to perform before I send them. The different checks are useful for spotting things I might have missed, especially when it comes to email authentication and potential spam issues. Review collected by and hosted on G2.com.

I haven't had any major problems with it so far. The results can be a little detailed when you first use the tool, but once you understand what you're looking at, it's pretty useful. Review collected by and hosted on G2.com.