MTA Open Mail Relaying Allowed (thorough test)

Nessus has detected that the remote SMTP server is insufficiently protected against mail relaying. This issue allows any spammer to use your mail server to send their mail to the world, thus flooding your network bandwidth and possibly getting your mail server blacklisted. C Tenable Network...

NTMail3 Arbitrary Mail Relay

Nessus has detected that the remote SMTP server allows anyone to use it as a mail relay provided that the source address is set to ''. This issue allows any spammer to use your mail server to send their mail to the world, thus flooding your network bandwidth and possibly getting your mail server...