This week's book giveaway is in the OCPJP forum. We're giving away four copies of OCA/OCP Java SE 7 Programmer I & II Study Guide and have Kathy Sierra & Bert Bates on-line! See this thread for details.
Unless it's your ISP and you're connected to that ISP while sending. My ISP certainly doesn't require me to login. It sees I'm using their connection so I can use their SMTP server, also for other email accounts.
So Predrag, the question is, are you using a verat.net connection at the moment? If so, contact them about the problem. If not, try entering your login credentials.