Replace old com.sun.mail:smtp with org.eclipse.angus:angus-smtp project

The old com.sun.mail packages are now obsolete, and we just removed them from our project and replaced by new Jakarta Mail implementation project Eclipse Angus.

It would be nice, if we don't need to exclude all the packages manually, but newly added feature uses the latest dependency available.

The right dependency to use are:

<dependency>
  <groupId>org.eclipse.angus</groupId>
  <artifactId>angus-activation</artifactId>
</dependency>
<dependency>
  <groupId>org.eclipse.angus</groupId>
  <artifactId>smtp</artifactId>
</dependency>