Brian Candler writes: 

> On Thu, Oct 03, 2002 at 12:13:05PM +0100, cc wrote:
>> I tried adding PLAIN, but it made no difference.  I've also tried the 
>> Netscape Navigator 7 client (on RedHat 7.3) and that doesn't work either,  
>> despite telling it to use authentication.  I'm just downloading the latest 
>> version of Evolution on Ximian to try that.  What client would you recommend 
>> as having a cast iron implementation so that we can figure out if it is the 
>> client or not?  
>> 
>> Any other diagnostic recommendations to help solve this problem? 
> 
> For AUTH PLAIN, the simplest and safest client is good old telnet:

I've since tried another client (Evolution from Ximian) and that didn't work 
either.  I still get a basic "relaying denied" message. 

I've tried to connect via telnet and issue the AUTH command.  This is what I 
get: 

220 blah ESMTP
AUTH PLAIN xxxxx
502 ESTMP command error 

And in the maillog I get: 

courieresmtpd: error,relay=::ffff:XXX.XXX.XXX.XXX,msg="502 ESMTP command 
error",cmd: AUTH PLAIN xxxxx 

Just so that we're completely clear, my relevant lines in etc/courier/esmtpd 
read: 

AUTHMODULES="authdaemon"
ESMTPAUTH="PLAIN LOGIN CRAM-MD5" 

I'm just a bit confused becaue the INSTALL document says explicitly that 
Courier supports "LOGIN" and "CRAM-MD5".  It doesn't mention "PLAIN".  Yet 
it was Sam that suggested that I try "PLAIN" and I figure he knows for sure. 



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