I would like to use my RedHat 5.1 Linux as a smtp server for the intranet and use pop client like eudora on windows machines.
No problem for mail reading using pop3 protocol.
No problem posting messages for users on the server machine, but when I try to send emails to a different machine using linux as smtp server Eudora writes:
The recipient "email@example.com" is not
acceptable to your SMTP server. The message is not
sendable until the recipient has been changed.
If I try to do the same thing directly on the 25 port, I get this message when I insert the recipient:
551 firstname.lastname@example.org... we do not relay
How can I remove this protection?
I suppose this is an "anti-spam" protection, isn't it?
Thanks in advance.