Exchange Relay Authentication
Posted on 2008-10-09
I got an Exchange with the following situation.
ESM, under SMTP, under Access = Anonymous, basic, integrated
ESM, under SMTP, under Relay = only the list below and allow authenticated users/comps to relay
ESM, under SMTP, under Delivery, under Outbound Access = Anonymous
Smarthost SPAM Filter under SMTP, Delivery, Advanced
Telnetting to the outside, you get denied a relay
Anyone inside the network can telnet and send an email
I need emails to send both internally and externally
Users connect using Outlook cached mode, Outlook http, and webmail.
An example of my problem is UserA can telnet, and send an email from email@example.com to anyone they want.
I want to stop this, but don't want to stop mail flow or screw up the smart host? To do this, would I just change the outbound authentication to basic/integrated? Would that also entail setting it to authenticate with the smarthost?