SMTP problem?

[Andreas Ericsson]

Francesco De Santolo wrote:
> Hi,
> 
> I was wondering, why does nagios states that SMTP is down when it is 
> online and working if you do the command "telnet ip 25" ?
> 
Because it doesn't get the RFC compliant response. Any program can 
listen to port 25, but if it doesn't respond properly to HELO, 
check_smtp reports errors since it concludes something else than a 
normally functioning smtp server listens to the port. This is most 
likely some MS Exchange server thingie. They often refuse to follow any 
standard at all, but it can also be a smtp-server configuration issue 
(pop-before-smtp and such).

> Thanks.
> Francisco
> 

-- 
Mvh / Best Regards
Sourcerer / Andreas Ericsson
OP5 AB
+46 (0)733 709032
andreas.ericsson at op5.se


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