Exim: Is there away to block command when someone telnets to exim's port?

abefroman · 09-25-2010, 10:40 AM

Exim: Is there away to block command when someone telnets to exim's port?

Email won't send out unless they authenticate, but if there a way to total block them from typing all together, but still allow the server to receive email?

IE, to block this:

Code:

$ telnet mydomain.com 25                                                                                                                                                   
Trying 55.55.55.55...                                                                                                                                                                   
Connected to mydomain.com.                                                                                                                                                             
Escape character is '^]'.                                                                                                                                                               
220-server1.myhost.com ESMTP Exim 4.69 #1 Sat, 25 Sep 2010 10:37:00 -0500                                                                                                      
220-We do not authorize the use of this system to transport unsolicited,                                                                                                                
220 and/or bulk e-mail.                                                                                                                                                                 
ehlo                                                                                                                                                                                    
250-server1.myhost.com Hello  [127.0.0.1]                                                                                                                                      
250-SIZE 52428800                                                                                                                                                                       
250-AUTH PLAIN LOGIN
250 HELP

kbp · 09-26-2010, 08:47 AM

You can usually block certain commands, but you can't stop people typing altogether - that's just the way the protocol works. See this link regarding expand, verify and debug. You can only disable commands that are *not* necessary

cheers