Thank you on your reply. I`m not sure but it seems that sbcglobal, gmail and att has blocked all communication on port 25, they have a 587 and 465 open and i can make a transport to them on this ports but it needs an authentication by username and password. Does that mean i need to have account there to send anything from my corporate e-mail server to them? If that`s true ... i`m not happy by that. Maybe there is a smarthost that can be used for sending email to them ?
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