When I send an email from my server, the email headers contain the IP address of the server. Yeah, this is a problem, because the server is being the target of DDoS attacks. Using CloudFlare is not going to help if my server reveals its IP when emails are sent...
How can I send emails from the server without revealing the IP? If that's not possible, can I send the emails to a secondary server that will act as "shield"? How can I do that? I don't mind if the secondary server is attacked, emails are not that important, (I just have to send emails when users register on my forum, or when they receive private messages/notifications).