unless a user configures their mail client to do that on its own"
You can get around this by blocking SMTP traffic on your firewall except for your mail servers. This is also good to limit damage from virus/worm infections as most worms have their own SMTP mailer.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.