in src/main/java/org/apache/commons/mail/MultiPartEmail.java [379:397]
public MultiPartEmail attach(
final URL url,
final String name,
final String description,
final String disposition)
throws EmailException
{
// verify that the URL is valid
try
{
url.openStream().close();
}
catch (final IOException e)
{
throw new EmailException("Invalid URL set:" + url, e);
}
return attach(new URLDataSource(url), name, description, disposition);
}