The Configuration (RW) attribute of jboss:service=Mail MBean breaks (doesn't display the whole property but while setting it works fine) when encounters " (double inverted comma).

For example set the following in Configuration (RW) attribute <configuration><property name="mail.from" value="xyz@nosuchhost.nosuchdomain.com"/></configuration> and apply changes. Now on Configuration textbox you can see <configuration><property name= only.