Is this plugin a good alternative to this?
The only reason we are looking for a alternative is because of this:
Mandrill: wp_mail has been declared by another process or plugin, so you won't be able to use Mandrill until the problem is solved.
and the plugin author has already responded with this:
Currently DOIFD is only set up to use wp_mail. I am aware of the issue with Mandrill, but there is no set date at this time as to it's resolution.
Double OPT-IN For Download
So, we are looking for a alternative that will allow they use of mandrilapp plugin but give the exact same functionality or more.
Let me know if your plugin would do the trick or if you have other recommendations in wpmudev or outside of wpmudev too if needed?