I was happy with the SmartAssembly solution for exception handling, but I reported an issue on Red Gate forum and is not being solved yet.
What alternatives exists to SA? I mean with similar features (hosting your reports, sending you e-malis, etc)?
SmartAssembly has two main features - obfuscation and error reporting.
If you are using obfuscation, there are several free and commercial alternatives. The list linked to by TrueWill shows a good selection.
For exception handling, the only similar thing that comes to mind is Exceptioneer. A benefit it has over SmartAssembly is that there is a free version available in addition to a paid-for version.