HOWTO PREVENT USING ANYTHING as an email address in the SMTP command MAILTO.

Hi,

If I use TELNET on port 25 I can use anything for the senders' address. How
can I prevent this ?

I want to preven that someone from inside or outside of our domain can send
a mail from blabla@xxxxxxxxxxxx to anExistingMailbox@xxxxxxxxxxxx

Anyone knows how to solve this security issue ?

Regards,

Rudy


.

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