in commons-email2-javax/src/main/java/org/apache/commons/mail2/javax/Email.java [1147:1161]
public Email setBounceAddress(final String email) {
checkSessionAlreadyInitialized();
if (!EmailUtils.isEmpty(email)) {
try {
bounceAddress = createInternetAddress(email, null, charset).getAddress();
} catch (final EmailException e) {
// Can't throw 'EmailException' to keep backward-compatibility
throw new IllegalArgumentException("Failed to set the bounce address : " + email, e);
}
} else {
bounceAddress = email;
}
return this;
}