How does the MageMail integration work? Will it conflict with other extensions?
The MageMail connector extension has been built in such a way as to make it virtually impossible to conflict with another extension. Having worked for a major extension vendor in the past, I'm well aware of the potential for conflicts with other extensions, and have designed the connector extension from the ground up to make it, as I like to say, Certified Conflict-Free.
It doesn't use any class rewrites or even any observers.